So getting back to this thing. And to add to the confusion. lol.
Ive got a dummy engine bolted in the car using the front cover mount, and a 13b trans bolted up to it held in place by a jack-stand.
My 1st question is: Dose this look right? Is that the way the mount goes?
But the answer to that question probably doesn't matter because for one thing, I plan to fabricate some engine mounting points for a 13b, and also because the way the trans doesn't line up the way I thought it would.
This is the way the trans mounting location looks.

The left side of the picture is toward the front of the car.
Is this right?
I have a junk 12a trans for reference. And the trans mount holes are about the same location as the holes on the 13b. 21&1/2 to 22 inches from the front of the trans to the mounting holes.
Similar dimensions that are the same on both transmissions are: Front of trans to output-shaft = 32"
The only thing different is the shifter location.
From the front of trans to the end of the shifter socket: On the 13b = 34", the 12a = 33".
Picture of the shifter hole.
I kinda knew that the shifter location would be off. But I thought that the trans mounting location would line up.
This is the engine location with that mount. Looks like a good location.
So I got to figure out where i want this thing and what to do about mounting locations.
I want to fabricate engine mounts for a 13b.
I thought I could use / want to use the stock location for the trans.
Other considerations that go along with this are the:
Drive-shaft: Use an FB or FC or Custom?
And while I'm at it, do I change the differential to a independent suspension type?
Also, what about an oil-pan?
Ugh!