Hey George :-)
Doin the same thing almost, Dr4 block, .040 over TRW forged coated pistons, 428 crank
Looks like Ima need around .087 off the tops of the pistons
Before that, gonna put a piston at zero and check valve pocket depth to see what needs done if any
Using 2.09/1.65 valves, top land to top of piston is .350 if I remember correctly
Forgot, mine are .013 in the hole with 3.78 crank
Ricky.