[jonnyk]

You're not going to gain much other than a really low powerband and lots of torque. That induction combo is a ton too small for a 393.

Problems you'll run into: new oilpan, hood clearance (cowl needed), new headers, you need a 351W lower intake, and you'll have to convert the block to hydraulic roller with a different cam, or go to a link-bar style hydraulic roller lifter.