You'll hear it if it does, but it should not detonate. I think you'll be fine. I bet you'll find the 750 and more timing wakes it up, but don't change both at the same time. Reset your timing, then go drive it and get a seat of the pants feel for it. Then swap carbs and test drive it again...or better yet, swap them at the track.  CHIP
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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