Or you could wait till the end of this month and buy the new LSX block that has a 4.25 inch bore and a 4.5 inch stroke. Then throw the l92 heads and l76 intake on that and have a 500+ CI motor that will bolt up to your current trani. But you would have to beef up your trani to support the 400+ horses.
2004 EXC Silverado 6.2L
Mods:
6.2L L92, Ported and Polished stage 3 heads, 95mm Throttle Body, 100mm MAF, NA, Pacesetter LT Headers, Magnaflow X-Pipe Muffler, Electric Fans, 160* thermostat, 2" Drop Shackles, Hellwig Sway Bars Front and Rear, Monroe Reflex Shocks, NGK Spark Plugs, AMW Oil Catch Can, 17"x10" wheels on Kuhmo Tires.