This would be my input, as i have passed this on before,
Not in the car, on the floor, get a KE70 crossmember as a spare, have it sit under the CA motor minus the CA engine block mounts where you want the motor to sit, obviously as close as possible to avoid bonnet clearance
Use whatever engine mounts, id suggest Ford Cortina 250 Crossflow mounts
Get some cardboard, trace the bolt holes from the CA block mounts, and make sure that it will be a square piece of cardboard, measure and have angled pieces of cardboard that will meet up to the engine mounts, as two rails that attach to a base plate,
have these 4 peices made in 3mm mild steel, and welded with the respective holes and that should bolt up to the 70 crossmember
as for the crossmember, if you have the CA box member, cut the side plates off as it will need to be spaced, once located, new plates made and should mount on the corolla stock box mounts under the body
This is one method, don't know if it helps either,
but once you got those mounts made up, your halfway there
This is one method of doing the conversion, feel free to criticise too