Motor home 727 in duster questions
These type of swaps are never simple especially when you don't have much experience.
The first mistake is trying to do this with a "small budget" mindset. Things are always much more expensive than you think, especially if this is the first time doing this. A lot of things like cooling system, brake system suspension wiring, shifting linkage, engine accessory brackets, belts and on. Does the engine even run good ? Condition of the spark plugs, engine leak down/ compression test.
Verify the engine and trans condition before you start. May be installing a problem.
