Its weird that the throw out fork goes out the bottom of the bellhousing and not the bottom/side like on a Starion... or using a lever arm like the D50/Mightymax.
What is this transmission from?
Getting the engine bolted in is about 10% of the way there.
The next 80% can go quickly with help and skill.
That last 10% takes about as long as the 90% that came before it.
If you were set on using it, the it shouldn't be too hard to move the clutch fork. It's basically just a rectangular hole with a spot for the pivot ball. At least it seems that simple to me.
Do it in a Datsun!
1972 Datsun 510
7-bolt 4G63T, EVO 9 pistons and rods, Garrett GT3076R, "flipped" stock intake, Toyota R154, Z31 R200 w/ CVs