Have you guys heard of these heads or this company
http://www.motorsports.com/sbcaluminumsbchevycylinderheadsvortecrace.aspx
I have an 89 c1500, 5.7 tbi (with all the tbi mods), 5spd, long tubes, full exhaust, crane cams ignition and coil, 1.6 roller rockers, open element air cleaner, etc...