i am planning on rebuilding my motor in the jimmy. what kind of numbers could i expect with these kind of parts? .30 over rebuild kit flat pistons 272/282 .442/.465 summit cam and lifters vortec heads vortec intake msd ignition box same tbi unit Any suggestions? i dont have a big budget so im taking my time part here part there but i think this would be a nice upgrade over the 170,000 mile motor in it already. ohh yeah i have 3.73s with 36in PJs but i plan on putting in some 4.56s and some 40s.