So guys I am debating on going auto or not? I am building a higher c/r 10:5 corba with custom cams to spin 7.5 rpm. I will run a 82/85 mm precision with a 1.24 ar. I will drive it 90% on street and a few times down the 1/8th mile track. So should I do a t56 mag or go with a 4r?