Well, think of the dynamics. You have a different combustion chamber, and possibly smaller ports. What about the valve trains? The cam may be effected...
Like I told you earlier I have a 327 manifold married up to a 1980 350. The intake ports are smaller, and I had to advance it quite a bit to get it to stop stumbling on acceleration (even after I rebuilt the carb), but it runs great now.
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'69 3/4 ton C20 2wd-350ci/TH400
'69 3/4 ton Custom 20 2wd-350ci/4sp Manual
'99 2wd 5.7 Chevy Tahoe
Seattle, WA.
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