I don't think that's a great street combo with 3.23s in a fairly heavy car.
Too much cam & converter, IMO.
Sure, it'll sound nasty, but under 3500 it's gonna be pretty soggy.
10.4 is a lot with iron heads, even with all the overlap in the 484 & 509 MP cams.
I agree, the combo isn't very good. The engine might run in a higher elevation though... You live in the Rockies... 4000+ ft?
Agree with others... a 383 with the .509 cam and 3.23s is going to be very lazy. I ran a 383 with the TRW version of those pistons, a much smaller "484" sized Comp cam, 3500 converter, and 3.91 gears, and it was a real dog off of the line and a chore to drive around town. FYI, my pistons were 0.005" in the bore and something like an actual 11:1 with the FelPro gaskets, and I ran pump gas just fine.
You weren't asking for advice on the combo, and cam swaps are expensive these days, so just drive it and see how you like it... although it might be an easier time to do a cam swap if the engine is out of the car.
