My DART block it's just the block, 4 bolt main .030 over... I don't have a rotating assembly for it yet... I can make it a 306, but if i end up doing anything with it i will make it a stroker motor... I have a 306ci based on a stock block in my car now... It's a stock rod, stock crank, DSS Pro Lite pistons, main and valley girdles... I bought the DART block for $1200 all ready to go, machined and everything, ready to be assembled... (i could not pass on a deal that good) I just need crank, rods and pistons... Thats why i have been thinking about a stroker... I just want to see how far i can push this stock block without splitting it down the middle first...