340 or 440

My vote for 340. 440 is going to add torque, can you put that to the ground effectively? 340 can spin them too. Stroke the 340 to a 426...good heads and your 500+ HP. Whats the stock 73 440: 220 horse, 350 torque? 68 440 @10:1 was a torque monster...73 not so much.