Like stated the power is in the heads intake and cam. Now you can do this the cheaper way. or you can go all out.
Were i am i can get a 302 From a late 80's mustang for about $300 thats 225Hp 300LB Torque. or you can just grab the heads.
Higher flow heads. the 1994 Explorer 302 came with GT40 Heads Stock the 1996+ came with GT40 P Heads they need different headers they flow alot better then stock late 80"s Mustang heads
Or you can go all out on a set of aluminum Heads that Flow Nice and are Light.
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