The best I have found for 2-4 tunnel rams is REAL Pontiac SD AFBs.Next would be Buick and 3012 Chevys for smaller CI and 3705 Max wedge for larger CI.I run the 750s on my 421s.The 3705s have to be rejeted as they have staggered jetting for the Xram intakes.The real factorys are very pricey compared to the others.61-63 on this site can set up a pair of AFBs.Tom
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