The 470 will give you a little more compression with a flat top piston. The piston would be lighter per a given length of rod, but I think the 6.535 rod is optimal for a 470 which is also cheaper than a chrysler rod. The 3.9 stroke also takes a little out of the radius of the crankshaft which arguably helps the strength. My machinist quoted me 150 more dollars to offset grind. Being the chevy rod is cheaper the price comes out close.