Mopar purple .528 for a 383?

The 3.91s and four speed will allow you to run any intake you want.
But good points were raised about c.r. You really don't know what pistons are in it aft3r all this time.
( I think I have used five different single plane intakes vs two, whoops, one dual plane. But my cars have 3.91s and 4.10s)