400 Build vs 440 Build

I stroked my 400 to 500 cubes. With ported 452 heads and comp hydraulic roller cam, the engine made 550 HP and 610 TQ on the dyno. So far it has gone 11.80 at 115 MPH with 3.55 gears thru the mufflers. Hood clearance is tight using the factory air cleaner. I would do the 400 again, the only thing I would change is to use the 400 rod length instead of the 440. My pistons are like hockey pucks and the oil ring is in the pin hole. Piston slap is noticeable.