Your build is very close to my 518 pump gas motor, I didn't see what compression ratio you have or are going to use My 518 is 4.375 bore with 4.300 stroke, 10.84 to 1 comp ratio now. My 440-1 where CNC ported by Jeff at MCH and my cam is smaller, Comp Cams custom grind solid roller, 260@ .050 intake with .420 lobe lift, 266 @ .050 with .409 lobe lift on the exhaust, 108 LSA in at 106 intake side with Harland Sharp 1.64 rockers, it ended up with right at .700 net lift at the retainers. I used a 400-3 intake with a Summit brand 1.5 inch thick phenolic cloverleaf spacer, I dyno tested four different Holley 1050 Dominators, the best one made 775 HP and the worst one, it had been converted to annular boosters, made 750 HP on Oregon pump gas with 700+ ft lbs on all four carbs If your going to be limited by traction don't use a close(less than 110) lobe center cam, it will knock the tires off of the car at the hit of the throttle I stretch the rear wheelwells five inches on my 1971 Duster and switch the rear suspension to ladder bars and coil overs due to the results on my motor being dyno tested before I had the chassis work done The motor was a 400 block 512 low deck with a set of ported 906 heads and low compression ratio (9.25 to 1 )for the CA pump gas that I had to use back then, that combination made 612 HP at 5600 RPM and 644 Ft. lbs at 4500 using the low deck six pak Edlebrock intake and stock type 440 carbs