360 vs 440 79 coachman

Once the 360 is running and mobile and the house rebuilt I am wondering what the 360 will be like on hills and onramps etc, is it going to be a dog? Would a 440 swap make sense?
If so what would I need to move over? I know from looking at rock auto the motor mounts are different so do I need to take the the bracket off the frame?, is the trans cross member the same? Do I need to move it? Is the drive shaft the same splline /length? Assuming the swap is made the potential donor is a running driving 76 sportsman, we are getting it to gut the house interior and for the bunk over the cab as it's a 1 piece fiberglass design, I like it a lot better than our coachman but the frame is Swiss cheese, atm asking for ideas, for a preswap checklist, or advice yay/nay on the swap overall