[HiFlow5 0]

No, you cannot "bore" a 302 to a 351. The best you could do is stroke the motor to a 347, by increasing the stroke of the crankshaft. I'm a fan of stroker motors, so that's what I would do. Look at the combo in my sig. With the parts I have I'm making an estimated 350 HP at the flywheel. As for as "boring" the heads as you put it, no. You could have the heads milled for increased compression, and then ported to the max for the most air flow. But for the money you would spend on that, you could have a nice set of alum heads. If you want to make some decent power, a good place to start would be a quality set of alum heads, intake, a decent cam, and the regular bolt ons, TB, MAF, RR's etc.