There is no reason to spend that kind of $money$ unless you wanna build a 900~1500 horse power motor, a stock block wouldn't live as long as an after market block when built correctly, its no secret that after market block are Expensive, if you wanna go racing your gonna spend $10K~$25K on a good Engine.Just spoke to a gentleman stating he is delivering three hemi blocks to reputable builders to check them out ... he will have 426/440/400 blocks ..... BUT price are going to be near 4000 and then need final machining.... so you better hold on to your stock blocks unless you want to pay this money ..