A couple of days ago i got my 340 that i have been wanting for a while, and it came with a 360 donor with a redblock on it, how difficult is/ can the swap be?

Very doable but you may have to use the 340 mounts for the gearbox and get creative with the mounting holes for the engine brackets. I'm not 100% sure if the redblock fits under the standard Mk1 bonnet, you may need a GLS/DLS bonnet.