you need a bigger blower or a smaller motor,,,lol, i have been down this road before. just go back to the turbo....i might know were a kit is at.....for a little swap and some cash...lol.

i had a 370ci motor with a radix on it and i had to go to a 8rib set up and a inn. west crank pulley just to get 11psi on it..and i was 10.1 motor and it made 600rwhp with a 112hh blower..

 

yikes! and mines a 408 with 8.8 to 1, well i think i have this blower sold to exodus on here, sure wish i didnt have to get rid of it. its so damn beautiful, anyone know where KB is? i have to get the rest of the hot and cold pipes from him

 

im sure he want be to hard to get up with. hell of a guy KB is! what size turbo are you going to go to. i should have mine dyno this week. ready to see what this 88mm and new 408 will do..