306 stock block with a DSS main support a fogger and let it FLY!!! DSS claims to have made 650hp on a stock block with theyre main support. In all seriousness though, dont waste your time with the stock block. Girdled or not, its only going to take so much and its not worth the time of yanking it all back apart again. Start off with a good foundation. Dart block is def the way to go. My 363 with 13:1 ross pistons, Hbeam rods, forged crank, Ultradyne cam and TFS "R" heads ported to the hilt with kooks custom headers on MUSCLE is making 540 to the tire... so without a blower or a good hit on the bottle for a 306 to make that it would have to be something nutty!!