Sorry if this question has been discussed before. I'm replacing the driveline in my stock '39 Master Deluxe. Rather than sitting, I want to use the car as a daily driver. Want more power, better economy, and reliability for years to come. I'll put the original 216 on a shelf, or maybe make it a coffee table. Up grading to a 235 or better, so out goes the torque tube. However, I want to keep the 6 lug wheels - too much invested in two complete sets of rims and tires. Besides, 17" GM artillery wheels look great! Plan is to have the axle drilled for six lug. What rear end should I look for? What later model will fit? Any help will be appreciated!