Hello to all, first ever post! Picked up a 70 torino w/351c-4v from my brother-in-law. It's my mid-life crisis! Car has radical cam, 2500 stall converter and c4 automatic. Original rear-end has 3.00, brother-in-law says I need 4.11s in back to really enjoy the engine. He says it needs to run at higher rpm to function correctly. I drive it around town, weekends, etc but have no plans for taking it to the track! Thoughts...4.11, 3.89,..? Any help would be appreciated.