First you need to make sure it will fit and that the sump is the right shape, if you can then suspend the engine in the compartment in the correct position you will be able to see what is required.

You will need the mounts from the transit engine, fit them to the engine and then look at their position above the chassis, if you are lucky you may be able to fabricate some brackets that will use the original mounting points, if not weld a length of angle iron from two suitable points to sit the mountings on.

You may have to modify the gearbox cross member and also the prop shaft.