A stock 360 magnum with some boost will hit 450 hp or better i am sure. A friend of mine pushed a nonintercooled boneyard 318 to 534 hp before he lost a head gasket! You say cheap, it is darn hard to beat the power per $ a turbo can give you. Besides , they work well with less converter and road gears!
Exactly what I was thinking, maybe a bigger turbo or better cam then what you have. You're not going to get a bucks down better package than where you're at now.
Me personably, I would spend the money on a 5.7 Hemi and turbo. Should go easily in your truck. Hot Rod did a build-test awhile back with a stock junkyard engine and a turbo they had used on another engine, made way over 500 hp. With bolt on stuff.
