Yeah, big valve heads with a high lift/short duration cam and a dual plane intake....polish your intake's runners and tbi flange, and port & polish your head's intake/exhaust runners and valve pockets. Switching to roller lifters with a roller cam will also help free up power and it'll be alot less strain on the engine. If you decide to run a valve lift over .500", make sure your guides are clearanced and spring seats are lowered. Your tbi's body should also be replaced with one from a 454, and a tune will be required.
Also, to address the comment on trans wear being an issue: when not having the new gears installed yet, the torque from the engine will break apart his trans due to the strain of having to move the taller tires without sufficient gearing to lessen the strain on trans. He mentioned he was wanting more torque, torque is what tears up manual trannies.....whereas horsepower is what burns up automatics.