My dad has a customer that is building a 1/4 mile '72 comet. He is on a budget, but wants cubes. He was going to go with a stroker, but couldn't afford it. My dad came up with the idea of building a 400 with 4bbl cleveland heads on it. However, NOBODY makes a perf. piston for a 400. Has anyone ever done this before? I'd like to hear any ideas.