Since you have a stick I’d go T-rex. Just make sure you get it tuned right. I’ve seen people with good parts and shit tune go slower than stock LS. Don’t do heads. If anything shave them .030 and port them. Save your money for a 6.0 and go with L92 heads, they are sweet. I have a set and the runners are like a big block head HUGE. GM makes an intake with injectors for $500 cheap. I’d go that route if you want to spend money. It’s nice making big power, but it sucks when you can’t put it down. Then you have to spend money on the suspension.