Nearly all the motorhomes of that era are based on a Chevy p30 chassis/454 big block motor and so mechanical parts are available. However the ancillary systems on MH of that age will be on their last legs or if you are lucky have already been replaced. I am having a 1975 Airstream MH re-built with all new/modern systems etc if you have to do that they are a money pit; like I had to buy another as a donor because the whole MH was cheaper than some of the parts. So be careful to make sure everything (especially the dash AC) works.

Also remember a 454 will be about 10mpg (9 if you are towing).

Caspian Blue '03 BA, Union Jack/Stars and Stripes paint, BUBs, Progressive 812s, and lots of chrome