Why only 400? Engine masters got 600 out of a chevy 305, with a monster nitrous setup. $2000 in a 318, make 300hp n.a. and hit it with a 200 shot? Easy mid elevens in a decent car.
Still under $3000.
Lol I just noticed a vortech kit for the magnum 5.2/5.9 on ebay everything except the super charger $1750 shipped a p2 super charger about $650. Bang for the buck