Why not build a 340?

Finding a 360 in so cal is harder than one might think. A 360 is what everyone is looking for. Guy at cylinder head only mentioned that 360 heads are getting hard to find. I know where I can get a 360 block only for $700. Ya, not as easy in so cal as it is elsewhere, it seems. And the other part of getting a 360, I have no idea what year range is best and or the ECU fuel injection, ignition trigger, etc. So many different 360s. Roller cam, heads, ignition, fueling..