383 or 318

A mild big block in an a body is a tire smoldering machine .
Just built to 68 Magnum Specs, would be cool.... now add some porting to the 906s , a .474 Street Hemi grind cam, Headers, 2.5" exhaust, 750 Holley, some 3.91s. Electric ign, and a single plane divorced intake? Along with some good Fasteners, high volume pump, a good baffled pan with w/a Windage tray......