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Don , put a 4" arm in that dude and you will never go back. I love the power they make.
Granted not a street car, but I was STUNNED that my 416 with RHS heads would go 10.30's first time out and a best of 10.14 at 3100#! Also, of note best 1/8 mph is 107 and change. Must have some decent mid-range power...
LOVE the 4" crank small blocks!!
Your combo please including transmission, gears, etc. 
Please tell me more about your cylinder heads.
67 Dart GT 340 4 speed
70 AAR Cuda 408 6 barrel
96 Indy Ram original owner
2011 Hemi Durango
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