Originally I ran one of my old 2x1 manifolds, a Weiand, with a pair of 5200 Holley Weber pinto progressive two bbl. that set up ran pretty good. I then sold a 56 pickup to fund some house repairs and a new Clifford intake manifold and a pair of Weber 38/38 carbs. That set up ran really well, always a street car. But I had a pair of Holley 2300 350 cfm carbs that I have had since 93 or so but never got around to using so I decided that with the change in heads, I would sort out how to adapt the intake for the holly carbs.
First I had to make up some adapter plates to fit a holley four bbl. the carbs are actually too wide to fit so they need to be spaced a little further apart. Interestingly enough, speedway makes a two bbl. adapter set up that allows you to move the carbs around a bit. Then it’s on to cobbling up linkage and getting it installed. I did not make any jet changes. I did change the power valves from 8.5 to 6.5 because my motor makes about 12 lbs of vacuum at idle so the 6.5 were better suited. Because the bowls face the firewall, I installed jet extensions and notched floats.
