I think his point was that gears dont equal heads for how much each costs. ESPECIALLY AFR's....unless u find a killer deal on a used set. I feel like u could do the rear and nitrous for what heads cost.
Also, heads have a lot of other upgrades. Cams, lifters, push rods, roller rockers, valve covers, gaskets, a new intake, injectors, fuel pump (maybe), MAF, etc etc etc.
It is pointless to do JUST heads on these stock motors.
Good luck with the gears!!! Another option is a 3.90. I think if i did it again that would be my choice :SNSign: