Okay, 88 4.2, new engine, Howell TBI, new ignition set to 8 btdc. 2.5 inch Rc lift, 3.07 gearing, with 31/10.5/15s. Problem is that I can't get over 1500 rpm in 5th gear, and I have a lot of vibration in the entire drive train. No power going up hill, have to down shift going over a pebble. Been fighting this for about 6 months.
A year thoughts?