Got a customer who had to sell his cummins and wants a motor in his 85 to perform similar and here is what I got coming to gether, what do you guys think?

340 block 4.070
4 inch stroke
.512 lift [Email]230@.050[/Email] single pattern lunati hydro flat tappet
R/T magnum heads, lightly ported
Eddy RPM intake
650 Thunderseries Eddy
1 /5/8 summit brand headers
Mahle pistons (really nice light weight, hard anodized teflon skirts!)
Stock worked rods with ARP bolts
9.3 compression
.040 quench but it is a smaller area than I like.

Anything I am missing or doing wrong?

Stock 12V cummins is what 190 HP 400 TQ? I am hoping to make 300HP and 500TQ at a low RPM range. Truck has 3.55s and 727 4x4.