1974 Dart Swinger

Funny how you fall into possible parts and pieces for cars. My son was talking with the next door neighbor yesterday and mentioned we were thinking of swaping motors between the 4 and 2 doors. He makes a call to a friend, and this friends has a rebuilt 318 and trans sitting in his garage he's willing to part with for $800. He claims it makes around 275HP. I have yet to see this motor and maybe we'll go check it out this weekend. Does this sound like a good deal depnding on what he's done, (which I'll find out when we go look at it)?
We looked at the front disks and rear drums of the 4 door today, and they look much better than the 2 doors. Disc look smooth with real good pads and the shoes look real good in the drums. I think we'll just swap both the cars brake systems this spring. Wish I'd taken pictures to post but it didn't even cross my mind.