I'm leaning towards the too big, too small theory. Factory 2 barrell manifold isn't real special. Quady or a vac sec 465 on a stock 4 barrell manifold would be the go but i'd definately run the 350 first. As a temporary measure you could put the 350 on the 4 barrel manifold. redline make an adapter. I've done it before and it isn't perfect but its better than the two barrel manifold
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