When you over bore, you raise the compression. I believe on the 235, I know this is the case with the 216, when you mill the head, you need to set the valve seats in. Back in what I call the good old days, guys would fill in the combustion chamber a little with weld, to raise the compression. This, and a 3/4 cam, is alotta work (money) for little more bang. Plus, sticking a lumpy cam in there is going to drop your torque, so if you wanna go on the street and strip, you'll want a 4.11 rear end, with a stock tranny. I don't know about t-5's. Once you put the headers and lake pipes on, it doesn't matter how fast, or how much power you've got. It'll sound like you're racin on a dry lake. Its a very distinct sound.
