B1e9a8u7

New to the forum. Long time shadetree mechanic mostly on old school diesels. 1st Chevy and gas rig in 10+yrs. Anyway. I recently bought a 94 K1500 from a friend of mine. Truck recently had a new longblock from autozone installed. Came into possession not running. After getting it timed correctly and setting the lifters she runs good. My question is its just a sluggish ole pickup. Im just looking for a lil more grunt down low What would you guys suggest i start. I have a 4yr warranty on engine so ki da waiting to open it up for awhile but as far as bolt on whats the best header that wont break the bank any other bolt on goodies?