thicker head gasket, port and polish the head, air and fuel ratio <-- important, check oil often<-- dont run too dry or too full, valves and springs upgrade, cams upgrade, port and polish intake manifold, upgrade throttle body 68mm should help, get s-afc, dsm 450 injectors, if on the budget dont touch the block yet.. once u start on that it's going to keep going.. with all that done run 7psi daily, 10psi on the track once in a while.. repeat once in a while, and dont try to rev too high.. keep it around 8500rpm <-- u kill ur engine faster that way on turbo unless it fully built to rev to 10k