How about destroking a 4.0 with the 199 crank. That would give a little more displacement with the larger bore of the 4.0 but the short stroke crank. Could use the long 199 rods and custom pistons. I myself prefer the largest longest stroke you can use for the torque. My .060 over 258 turne 6000 rpm when I used to drag race with no problems. Mike
