what CR should a 383 run ?
you said new crank & the right rods, were you talking 350 piston with a 400 rod (5.565) and 400 crank ? (what RPM will this setup turn ?)
or is this a better way, 350 rod (5.7) , a 400 crank and a special piston for a 383. (what RPM Will This Turn ?) and a little grinding on the rod bolt heads or grinding a small base circle in the block for clearance ?