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bill you are right on the target - the off the shelf supply is the place the deals are because of the supply that is available is on hand -- its also in my opinion a bad combo i never liked it -- and the reason is< first and YES again the compression height < location of rist pin from top of piston is much closer to the top on a 383 motor with 5.7 rod < stock length < and thats what i dont like about the combo it loads the cylinder wall if you use a 6 inch rod or even better a 6.125 rod its better but piston size is an issue for street use to me maybe not others -- the angle of the rod as it turns in the block with the 4 inch bore has a different load effect than a 4,125 bore of a 406 motor its a math thing called ( rod stroke ratio ) some see it this way and some dont i could fill a 40 yard dumpster with the motors that came from other places that dident work it taught us what not to do if you know what i mean -- i am not sure why he dont just build a 9.1/2 maybe a bit more to one 383 steel crank i beam bushed rods KB pistons are light not the best but LW tool steel LW pins a set of alloy heads 195 CC ports 525 lift HYD cam make it bumpy a 650 DP with a msd 6 al w/ the rpm chip and blaster coil / wires high pressure oil pump not high volume/pressure, coated cam bearings and spec out the rods and mains to .002 and .003 on the crank small front LW balancer maybe alloy type, 3 speed trans or 700 type 355 diff it will be in the high 11s and he wont need a bar and can use OEM belts -- just my opinion -- jz
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