The age of the MH is not the question here, but the condition of the home. Some homes built in the 1980's are in no condition to move as they will literally fall apart when moved off their cinderblocks. Being it is a 1977 home I would first have the home looked at by a qualified house mover. They can tell you if the home is structurally sound enough to move. The home will probably need to be reinforced inside and outside in order to be moved properly. Remember this home will be traveling on highways where the speed limit is 55MPH so the home should not be allowed to fall apart on the highway causing a major accident situation. A reputable home mover company will not move your home if they deem it will cause an accident upon the open roadway.
I, for one, would not opt to move this home due to it's age unless it was heavily fortified.
Also you need to have a licensed electrician look at the fuse box or breaker panel to determine if the electric is sound in the home prior to disconnecting and reconnecting the electricity. That is another huge concern as well when you determine if you are going to move the home as any home moved must pass an inspection by the state when it is moved and placed in a different location and it just might not pass inspection once it is moved. I'd opt to keep it in the same location due to the final inspections being done now to ANY relocated mobile home. They just started the state inspection stuff around 2008 nationwide and you can't get out of this legally once a home is moved. This is for your own safety, and not to generate money either.
And you need to factor in the lot prep for where you intend to move this home as well. All in all the tear down, transport and final placement and setup will cost you in the neighborhood of $5,000+ depending on any "extras" the moving company has to add. And no, you just can't hook it up to the back of a pick up truck and move it yourself as you need to pull a permit to move it and permits are only granted to licensed home mover companies by the county.