@john ferguson I believe that era Campy triple crank had a 36t small chainring. If a 36-28 is not a low enough gear, we have ways of improving that, the easiest first step being a smaller 74bcd chainring with new mounting holes drilled (assuming you cannot just purchase what you want from eBay or some custom vendor). A link to a forum where someone else describes the process in more detail:
https://www.bikeforums.net/classic-vintage/1251559-campagnolo-nuovo-record-triple-crankset-help.html
The Campy 8-9-10 left brifters had about 12 or 14 2mm steps, so triples could be made to work but the shifts are multiple clicks. These might well work with your existing front derailleur. The 11 speed left brifter has less pull and fewer 2mm clicks, but I have made it work for a triple. The 12 speed left brifter is tuned to be a double with the standard 12 speed front derailleur.
Triple front shifting with triple brifters often requires patience and trial and error. The chainring spacers may need adjusting if you plan to use an official triple brifter setup. There at least used to be a Campagnolo 11 speed triple brifter, I think Athena, and I have 2 left 10 speed triple brifters as well which I think are Veloce Escape, each of which will have shift points tuned for triple rather than the many 2mm cable pulls. Shimano triple brifters also have carefully designed shift points for triples. Shimano triple derailleurs after about 20 years ago expected chainring shift ramps, but careful grinding of the derailleur to have the derailleur lift the chain made it work on a flat chainring.
Campagnolo Escape 10 speed brifters have ratchets, and are different than all other Campagnolo 8-9-10 brifters which have springs on a gear for index. I have not studied the different 11 speed Campagnolo styles.
I have successfully got a Shimano derailleur and brifter to shift a custom Stronglight 93 24-34-47 triple on my PX10 (and yes I know you cannot ordinarily put those chainrings on a Stronglight 93, but I can).
https://www.bikeforums.net/classic-vintage/1251559-campagnolo-nuovo-record-triple-crankset-help.html
The Campy 8-9-10 left brifters had about 12 or 14 2mm steps, so triples could be made to work but the shifts are multiple clicks. These might well work with your existing front derailleur. The 11 speed left brifter has less pull and fewer 2mm clicks, but I have made it work for a triple. The 12 speed left brifter is tuned to be a double with the standard 12 speed front derailleur.
Triple front shifting with triple brifters often requires patience and trial and error. The chainring spacers may need adjusting if you plan to use an official triple brifter setup. There at least used to be a Campagnolo 11 speed triple brifter, I think Athena, and I have 2 left 10 speed triple brifters as well which I think are Veloce Escape, each of which will have shift points tuned for triple rather than the many 2mm cable pulls. Shimano triple brifters also have carefully designed shift points for triples. Shimano triple derailleurs after about 20 years ago expected chainring shift ramps, but careful grinding of the derailleur to have the derailleur lift the chain made it work on a flat chainring.
Campagnolo Escape 10 speed brifters have ratchets, and are different than all other Campagnolo 8-9-10 brifters which have springs on a gear for index. I have not studied the different 11 speed Campagnolo styles.
I have successfully got a Shimano derailleur and brifter to shift a custom Stronglight 93 24-34-47 triple on my PX10 (and yes I know you cannot ordinarily put those chainrings on a Stronglight 93, but I can).