I'd be shocked if the car didn't move better with the mag heads. The performance was not in question in my mind, it was if I wanted magnum parts under this hood... LOL.
P.S. - this Duster may not be my fastest Duster when Jaba and I race. I may be racing him with my dark blue car.... time will tell. I still have a junkyard build (literally junk yard) 360 I want to do. I have the pieces - block from the scrap metal pile, mag heads/intake, MP cam, and the rotating assembly from another 360 headed to the junkyard.... LOL Doesn't that sound like fun??? :D