Hey, new to the site but well established to Datsuns, particularly 510 and 240. Wondering if anyone has any insight asto puttin a l20 into a 520. I have a 78 donor truck with a solid motor, 5 speed. I can see that it will be tight but i've got the pulley from a non-air conditioned and the fan with a back offset. I can modify motor mounts and trans mount, just would appreciate any imput before I begin as to any major issues. Also anyone interested in a J motor. Was a solid runner until my son over heated it. Still fires but blows alot of steam. thanks