Toyo Kogyo/Mazda transmission... but they are different due to the transfercase flange on the rear. Also I'm pretty sure the 4.6's don't have the same bell housing bolt pattern as the 4.2's because the 4.2/3.8 share the 5.0/351 bell housing... If they are the same then I already have a transmission.
1983 Ford LTD wagon:
351w, Comp cam 280H, Edelbrock Performer intake, Holley 650 DP, BBK longtubes, BBK xpipe, Flowmaster original 40's, 8.8 LSD with 3.73's, Granatelli upper and lower adjustable rear control arms.