Just came across this project. I've completed my 302 swap in a bagged Mazda. Check out my project thread in my sig for details.
But a few things I'd like to chime in on:
I used 87-93 fox body Mustang motor mounts. I have no idea which was driver and passenger side. I flipped them around a couple times and did what I felt fit best. I used the stock Mazda frame mounts, just had to drill out the slotted hole bigger. I used power performance polyurethane mounts and there is no difference in convertible or hard-top mounts...
I used a stock 88' Mazda B2200 rear-end, but had it shortened 2" (to clear wheels from bedsides) and an 84-85 RX7 LSD differential. I had a custom 1-piece driveshaft made using a mustang yoke on one end, mazda flange on the other.
I used a T-5 transmission and converted it to hydro so I could keep the same setup that the Mazda originally used. Granted, I needed a new (larger) clutch master cylinder.
My truck had manual steering to begin with, so I stuck with that and removed the power steering stuff off the 5.0 motor.
I relocated my battery closer toward the front passenger headlight. It was already on the passenger side though. I only had to relocate it for wheel clearance issues because I was bagged.
I used an 87-93 mustang 2 sump oil pan. I still had to modify the engine crossmember.
If I had to do it all over again, I would have used the Ford motor sports shorty water-pump and re-did my whole serpentine pulley system. It allows for about another 1.5-2" of clearance between the radiator. Speaking of radiator, I used an 87-93 mustang rad.
There is a nice how-to on Mini truckin' online for this swap. It helped me a bit along the way. Good luck!
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