You write "block" so I presume you mean freewheel.
As in previous post - yes - they were available.
If OTOH you mean a cassette, then you will be struggling. Dura-Ace Uniglide was available as straight through 8-speed 13-19 but it's the wrong splines for Hyperglide hubs. (I have a couple which I never used)
the most common ones from mid 80's to the onset of cassettes were maillard. Ones with red spacers were 5 and 6 speed standard spacing (same as modern shimano 5 and 6 spacing) and compact (green spacers), same as shimano 7 speed spacing. Off the shelf ratios were available, but most racers had a custom spec block. You bought the body and then chose your spacers and sprockets from a board which used to be hung on the wall of a typical racers bikeshop. The first generation needed a 2-peg remover, but later on they had a splined remover which is the same as todays shimano blocks. They then had an 8 speed, but by then cassettes were in general use and eventually gave up.
old blocks are up for sale sometimes on the ctc forum, could try a wanted ad there.
check his other items , i sniggered at the thought of a titlist mech
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