I have an '85 302. Im undersizing & offset grinding the crank to accept 5.2" rods, leaving me with about 317cid. The heads I want to use are from a 351w, car. They have 1.94"X1.76" intake ports, and 1.24"x1.04" exhuast ports. The 302 heads have a 1.94"x1.04" intake port, and identical exhuast port. What rpm should I try to make my power at? ill hope to run a slightly overstock cam, but things change.