I think I may have one that was in running order. It was on my 74 with a 302 and a C4. It's been in the garage in a box since I changed to an AOD about 2 years ago and I changed to an AOD type linkage two barrel when I changed the trans.
However, the one I have was bigger than the 1.08 venturi that is stock on the 302. Not sure but it may be a 1.23; which was stock on the 351 if I recall.
PM me if you're interested and I'll get you the details and pics. Thx.