As far as 302's, one would need to add an adapter bracket that uses the bellhousing bolts for mounting. They are available through the aftermarket. The same bracket would work on a 351w if it had no boss, BUT most (if not all) 351w's have the boss factory cast into them for such a purpose. (I am not so sure about an actual "roller" blocks though as I haven't seen looked for one.) In either case, if the boss is there, the actual hole would need to be drilled, tapped, and the face ground a little flatter as the factory did not do any finish work on that area--I used an angle grinder when I did a 1990 block.
T5's use a cable linkage for the clutch so such no pivot is involved.