But IF PRACTICAL as a rule of thumb you'd like to create uninterrupted flow paths for both intake and exhaust passages. This from many tech articles and sources, I can remember Jim Hand touting it.
So what can happen with a mismatch...
http://forums.maxperformanceinc.com/...low+velocities
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
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5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE