I HAVE A 69 440 HP ENGINE ,IT HAS THE FACTORY FLAT TOP PISTONS WITH NO VALVE RELIEFS.

HOW BIG OF A CAM CAN GO WITH ?

THE ENGINE IS ALL ORIGINAL AND FRESH (STANDARD BORE)

I WAS TOLD A THE MP 509 PURPLE SHAFT WOULD RUN GOOD.
I HAVE A 906 HEAD WITH SOME WORK ,NOTHING MAJOR

THE CAR HAS A 4000 STALL AND 4.56 GEARS AND
WEIGHS ABOUT 3500

WILL THE 509 RUN GOOD WITH THIS SETUP AND WILL IT HAVE ENOUGH CLEARANCE PISTON TO VALVE .

THANKS TO ANYONE WHO CAN HELP