I run a stock 74 440 intake with a spread bore to square bore adapter 1" and a 1" spacer, 800 holley and a 14"x3" drop base moroso filter. In my 65 valiant, engine lowered .75" on custom mounts.
My best mate runs a 383, performer RPM, 750 eddy, flat base 2" cleaner in a 68 charger.