Hmmm....just did a little math, and a 4.8 (293) bored .060 over ends up at 303ci.
From what I could find online, all the Gen III Chevs share almost everything, including
the 6-bolt crossbolted mains. I'm just brainstorming at this point, but it seems to me
that the Gen III would be more durable at the same boost and power levels than a traditional
small block. If the costs were similar, it would be very attractive.