i make 700 hp with my 500" motors and the indy dualplane.without a question the best one out there.it will fit under a stock hood,no problem.i even use a 1/2 spacer on mine.
today i'm dynoing one of my 500" motors.i will be trying:
indy dualplane 440-d
indy 440-3
indy 440-2 w/ 2" rise spacer to a 4500 dominator
mopar 337

the dualplane will be very hard to beat.the others might make more horsepower but the torque will be a different story.i use mine in a street car,so torque matters.
i will post all the results and graphs.my combo is:
500"
13.1 cr
cnc sr,s flowed [Email]367@.700"[/Email]
solid roller 272/276 @.050 .702"

guessing about 700-725 hp 650-675 tq tigger,where in va. do you live? i'm in va.beach