The Mopar 403! Very easily accomplished with a 5.9 magnum block and forged pistons because most magnum blocks still have the cross hatching. Torque plate hone to round for piston to wall clearance. Also easily accomplished with any of the 318 blocks that will hold a 4 inch bore. Some people will ask why not build a 340 or a 360, I'm one of those who would ask why not build a 318. It's fun seeing what was originally a grocery getter economy engine that average people see only for that get turned into so much more. It's about as different as I view practical to build because I've seen the results, and they are impressive! The parts are already out there that can make it happen, and probably for less than it would take to build in the small bore engine.
