Guys, I know we are all individualists and want to prove how smart we are or we wouldn't be playing with this stuff, but please. I put 1000 miles on one of these motors this summer with a t-56 trans behind it. Great torque, acceleration anytime, 30-32 mpg and not the least bit fussy. If you want to do a manifold, do one that does not stick up in the air and mount the throttle body on top of the motor. Drive one of these first before you try to "update" it with 100 year old technology!