to fit a 5 speed into a 1200 you need to fabricate a new gearbox x-member because the mounts are 2-3 inches out. So if you're trying to use a 4 speed and put it back in but still using a custom 5 speed x-member, its going to have the same problem but in reverse. The 56a gearbox bolts up to the a14 engine fine, the 60 4 speed is just stronger (and may have slightly different ratio's?) you need to get a standard 4 speed x-member to bolt it up to the original mounts in the tunnel. Have a look in the wiki under gearboxes, it has a picture of a 4 speed x-member, will help you to idntify what one you're using. This may or may not help....