My 2 cents would be....
1. Any production based small block ( 273,318,340,360 ) We've already narrowed to 360's this go around.
2. Any non offset rocker aftermarket or oem "street" head... iron or aluminum ( Eddy, Speed Master, Promax, EQ ect ) For sure next time
3. 600 lift max on cam... rollers allowed to let the magnum block in Why put a lift limit? Flat tappets work excellent in the Mag block
4. Any RPM range...if you have the stones to spin it have at it I'm already thinking about 3500-7000rpm
5. Max horse power/torque per cubic inch calculation FTW So Max HP divided by Tq? I don't understand-please explain