[vicgto]

Originally Posted by PAUL K

I wanted Tom V to answer first as he is a carburetor expert. Here are a few more thoughts;


I think an 850 vacuum secondary would be the hot set up for your combination, especially if your converter is a bit on the tight side and car is a little heavy.

Paul, I figure this information may help someone. I actually did a comparison with a 750 vacuum secondary vs an 850 vacuum secondary this fall. I jetted the 850 80/86 vs the 750's 78/86 so I'm not sure how much that affected the results. The 750 performed slightly better, nearly 1/10 second and 0.5 mph quicker. The 850 had 1- 9/16 venturi and 1-3/4 throttle plates with an electric choke. The 750 had 1-3/8 venturi with 1-11/16 throttle plates and the choke housing milled off.