i have a 1977 mustang it has a 2.3 when i bought the car the engine was trashed at 53,000 original miles no wear on the car that tells me its 153,00 but anyways i bought a replacment 2.3 at an auction the engine was said to be built by esslinger it has the degreed cam and is really clean inside but it came with a 5 speed the engine and trans came out of a 90 somthing ranger anyone have a clue on how difficult it is to change from the 4 to the 5 speed?