Build your 360. They are alot easier to find than 340's which are in high demand by restorers so cammand a higher price.
IMO if the 360 had been built in the same time frame as the 340 with the samde basic specs as the 340 of the time it would have been the engine of choice, not the 340. Been like comparing the 361 4 barrel to the 383 4 barrel.