I have a 1966 coupe with a c code 289. It has a rod bearing going out and needs a rebuild. I would like to give the motor a little more power (no more than 100 more hp) without spending too much. Assuming the metal is in good condition, would it be more realistic to use whatever parts I have and have them tweaked (cam/heads/crank) or buy new parts (i.e. Edelbrock performer heads and cam)? I already plan to switch to a 4 bbl intake and carb.