power valve block off

For the jets, looks like I have 28 for the primary and 35 secondary. Based on info I found online, about 99% of 750 holleys were 28 and 31, so I'll drop down to the 31. (which I have from another main body I just pick up on ebay) As for the PV, I'll use the 6.5 the rebuild kit comes with and see how the car runs. This makes JBurch's info sound right on point. (I don't have a vacuum gauge on hand)

I'm also installing a manual choke which it's lacked. Thanks for the all the info guys.

I think you are reading the squirter nozzle...not the jet size...primary jet 71 and secondary 80...that would be with a power valve in the primary side and the secondary side blocked..