a 351 or a stoker 351 will generally make more power than 302 based strokers...
Say your wanting to have the joys of having a 351. but are having trouble find the oil pan, a good rebuildable 351 engine, or the swap headers its just a big mess. got to mess with all the accesories also.
a great alternative is to stroke your 302 to 347, almost those 351 cubes you want, but you get the easy of using the same 302 style headers, pan and all the accessories, the engine will look just like a 302 but its got power hiding within.
almost cheaper to stroke a 302, a good rotating assembly can be had for a little over a grand. would cost lots more to build a decent 351, and have to get all the parts to do the swap.