340 swap-small block k frame or motor mounts?

yea i double checked the price for the schumaucher's and they should actually be cheaper...i was looking through a site called national moparts who sells them for 300 canadian, but i think i would just buy them myself from schumaucher if i go that route...would it be easier to swap to discs with a k member change? I have front discs right now and was hoping to swap to discs....i just want to know the route with the best options for the engine swap...mounts or k member