I had an 84 shorty with a 6” lift and 35” Mud TA’s . I had a 305 with a factory 4 speed standard and 3.73 gears . Because I had a shorter wheelbase,the ride was horrible. If I kept it ( like I should have) I was going to install a big block 454 . I wouldn’t even change the intake to aluminum,as I’d want as much weight as possible on the front end . Judy my 2 cents . Good luck with your upgrades , and don’t be dumb like me and sell your baby