I say you go with a forged LS3 418 with a mild cam....you can easly save $4K with a built short block from a reputable shop and assemble yourself a great set of LS3 cnc heads and make great power....My last LS3 Engine made 532 rwhp and still holding strong in a 95 Nissan 240SX.....If you need info on a engine builder PM for details....No need to drop $15K on a engine if you can duplicate it for $9K-10K for the same results.