Rick, if it were a daily driver meant for 200k miles, I would probably reconsider, but on a weekend toy, I see no reason to worry about
oil rings and support rails.
As I mentioned up above, the number of Cobras, Mustangs, and other Ford street rods running around with 347's would probably astound all of us. Shoot, even the Boss 529 that I just built with a 4.420" bore and a 4.300" stroke in a 10.300" block used support rails for the
oil rings and that's not even the largest stroke that you can get for a 460.
I think personally, for the same money, I'd rather have the extra horsepower and torque.