I dont think that a single 250 will do, you have a HUGE power demand from your alone id bet, try and find a 300a.Its a 77-F250 with a built 460 engine.
I'm running 2 Group 35(I think) Yellow Tops uinder the hood. Well if 250 amps won't be big enough 300 should be shouldn't it. I don't really want to run 2 alts
This is gona be my show/comp/daily truck.