P coded cars are otherwise known as HP cars. Not police. I raided a '78 Doba for the current drivetrain in the Magnum. It has a P/S cooler, extra larger tranny cooler, a big A/C condenser. The engine has a upgraded cam, 260/268 duration, windage tray, double roller timing chain and of course, 4bbl. Ha ha ha ha. The biggest problem is the way low compresion I measured at 7.8-1. The restrictive exhaust sucked. If it weren't for those two items, the engine may have just performed nice. The rest of the raided drive train went like this; The rear is sure grip equiped 9-1/4 with 3.21's. I went and installed 3.55's. I added a deep MP trans pan. No other mods. The engine; The engine got a MSD and MP distributor. Headers with 2-1/2 inch pipe and a "H" pipe connecting the 2 sides. Mufflers are Hooker Aero Chambers. I just swaped on a Holley Street Dominator intake. I have to fiddle with the T-Q before I put it back on. Hard to start the cr with that carb for some reason. Even on the stock intake. So a 750 AFB sits on top for now. The T-Q did work well with the Holley intake. (When it was warm outside.) The AFB feels a little muddy.