dollar for dollar spent, the 360 will ALWAYS make more power than the 340 when building a bare block.

--if you put the same cam, heads, intake and carb on the 340 and the 360, built the short blocks with stock cranks, rods and use pistons that give you an equal compression ratio between the 2, it's a no brainer...the 360 will win.

spend your money on a 360 stroker.

408 is the common stroker size, and can make very good power and still be streetable. lotta guys running them in Dakota's dipping into the 12s with a 4,000+lb truck, and still passing emissions with them.