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390's or 450's are your best bet. Holley the 450's are cheaper (list 9773's are like $175. each) and will work right out of the box.
I have a really nice '63 lowrise C3AE9425 manifold you can have for $500. It looks new (it's not but it look it) throw a set of 1" phenolic spacer on it and it will still fit under your hood and almost flow like a medium rise. Oh yea. The spacers and studs I have too (new) for $75.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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