I'm going to assume you have a new block with 4.490 bore, correct? If so look at either a 4.250 or 4.375 stroke crank with the BB Chevy rod journal sizes and use a set of 7.100 long BB Chevy style forged steel H beam rods with 10.5 to 1 compression with iron heads or maybe even up to 11.0 to 1 with aluminum heads for pump gas thumbs The heads, exhaust, intake and carbs and cam will deteremine what the exact HP and torque will be up
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The deciding factor on the stroke length will probally be if you want to run a internal oil pickup or a external oiling system. The longer strokes, over 4.375, especially with the stock Mopar rod journals sizes and stock type OEM or aluminum rods, force you to use a exteranl oiling system to make the rods not hit the interanl oil pickups shruggywork scope

Last edited by Cab_Burge; 04/21/16 02:45 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)