I've got a 1980 FJ40 with a factory engine/drivetrain. I run 33's, and I just don't have enough power to maintain highway speed up hills(even small ones). I'm looking for recommendations how to gain a little power with more or less bolt on parts. What do you think? Holley 350, Weber carb, headers,......? Let me know what has worked well. I don't want to put lower gears in and lose top end speed.