idle problems on a blown 393

[Strim91GT]

I'm not positively sure the vacuum lines are all plugged as necessary. I do however have the set of four vacuum lines plugged that comes from the fenderwell and previously went to all the emissions stuff. And i've been told that it's probably not the map sensor because it's a mass air car, but the guy who told me this isn't 100% possitive. The mass air meter is a pro-m 75mm for 30 pound injectors, and i beleive it's a universal meter. I put the 30lb injectors and meter on my 302 just before i blew a head gasket for the 5th time and decided to go 393 with the car. And the supercharged 302 ran awesome with that setup. I think i will probably try taking the blower belt off today and lowering the fuel pressure some and see what i can do, and try unplugging the mass air meter.