Well you have a few choices. If you get the 10:1 pistons for the buick 350 you'll have somewhere between 9.5 to 9.8 and it will give you about what you want. Now if you really want a good torque motor then find a set of 3.0 rods and have the pistons made. A little more money but the longer rods will reduce the height of the piston and the legnth gives you a better dwell time at the top and bottom of the travel for better cylinder charge. It will also give you a faster reving engine. Same idea as running a 6" rod in a SBC. If you have the pistons made then you can also have them made so you have them almost to the top of the cylinder for a better squish to reduce detonation and also have them fly cut for valve clearance.