340 Piston to valve clearance w/RHS heads

I did talk to a guy who is a diamond dealer and he said that they could take the 51001 pistons, adjust the compression height from 1.802 to 1.820 to get zero deck on my block, and make them in 4.080" (0.040 over) for $725. He said its no big deal. I know it seems kind of expensive but w/e you only live once...the standard ones that they start with are 566g so my modified version will probably come in under 600g. These run the thinner rings for less friction. They're also 4032 so the piston to wall clearance is still able to be fairly tight.