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Re: 400 in the 68 Chevy
I'd do a straight performance overhaul on the 400 shooting for around 9:1 CR and using the Vortec heads. I've drilled the steam holes in them many times - just use the head gasket as a guide. you will need heavily dished pistons to get to a reasonable cr with the 64cc heads.
The performer is a great manifold - one of the very best low-rise dual-plane manifolds out there.
I am not a big fan of the Qjets - they were great carbs, but most of them are in pretty sad shape and for the price of a rebuild you can get a Holley...and have something you can tune.
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