for the record, the A series 63a dogleg 5 speeds are hydraulic clutch.
IF you have the correct box for the A series motor, you're going to need to remove the factory mount points from the floor pan and either weld them back on further back, or fabricate a new Xmember, and create new mounting points. I used a home made X member, with reinforcing plates on the topside of the floorpan.

As for the clutch, I had my A series flywheel remachined to take a 200mm pressureplate, and the 200mm L series clutch plate.

Post a photo of the gearbox looking at the gearbox mating face, and we'll know right away if it's for an L or an A.

If it's an L box, forget adapting it, it's more work than it's worth.