I really like the 351 based engines. To start a bone stock 351 short block w/ slightly higher CR pistons (10-1 or so) topped w/ something like an Edelbrock kit is an easy mild torque 400-443 hp. Scroll down a bit to see the ford small block kits.
http://www.edelbrock.com/automotive/...end-kits.shtml
All the internals are stronger than the 302 engine so they work fine as is. The large main bearing thing is a negative only in an engine that will see high rpm for long periods. If you start w/ a 351 this and later desire more power, your headers and intake can be reused on a 408 or 427. A 302 stock block is limited to 347. Also, in a coupe the slight extra width is not an issue. You might need to be careful w/ air filter choice due to the slight extra height.