360 vs. 340 vs. 318

I gotta be honest and tell you I like the longer stroke engines for the "Torque now!" factor. Other benifits of the 360 over a shorter stroke engine are quicker (RPM wise) peak hp and torque numbers for less stress and a no need to RPM the engine to the moon for peak power.
IF! you have a 340 right now, I'd stroke it.

IF you have no engine, the 360 is cheaper to start with because there like everywhere. Not so with a 340 block.