340 vs 360

The disadvantage of a 360 is small potatos.

More stress on a longer arm crank.
Cast crank stock.
Pressed pistons on pins.
Large bearing surfaces on crank.

All of which can be addressed and changed or modified. And since were talking about making HP! The only part I ever bother NOT to modify is the bearing surface width. It's OK, I'm not racing for the money. I can live with the extra friction of a slightly wider crank bearing. LOL

The bennifits are;

Cheaper to get
20 "FREE" extra cubes
cheaper parts, build dependent. But the 4 inch bore is very popular and getting cheaper by the week.

The 4 inch bore is limiting in a overboreing aspect, but that is also something that should be sonic checked. I'm not a fan of huge overbores to make magical dispalcement numbers (426), but if thats what you really want, far be it from me to stop you. Stronger cylinder walls make more power.