I have an 87 K5 with the TBI 350. I have a brand new 7004r and new 373 gears front and back. I am wanting to tow a 2K - 2.5K lb trailer and she is very hesitant about any sort of incline. Even without the trailer she is weak. It has 75K miles and has been well taken care of. What do I do to get more power without having to build a monster that isn't street leagal. Rebuild the TBI?? Headers??? High flow catalytic with flowmaster exhaust?? Pull the engine and put a newer 350 in there?? Remeber the street legal comment!!