If you don't want to replace the block most people will tell you to stay with a stock stroke, because a larger stroke will add stress to the block. You should probably put forged crank and rods back in if you don't already have them, I have a a set of GM dimble rods, an LS7 crank and a nice four bolt main block with billet caps if you are interested. Also you can a nice eagle crank and rods for less than a thousand