I am building 2 408 Cu IN Magnum based engines for my boat, Here are the build specs:
Scat Cast 4" cranks,
Scat H beam rods W/ ARP 2000 bolts,
Icon 983 forged pistons,( should work out to 9.2 to 1 compression),
Hughes SER 1828ML-14 cams,
ported Enginequest Magnum heads with 2.02 intakes 1.62...