TF Engine into a 75

OK I have access to an MG TF 135 (its my sons and he has lost interest in it, SWMBO says it has to go) and I was wondering if the engine would go into a 75 or a ZT and would I need the ecu, this has been re-mapped in the TF , also would I have to swap the gearboxes or use the Rover or MG one, (this could be a plan to pick up a project, I may even consider a Rover 25 or 45 or MG equivalent) the TF was pretty quick with this engine and remap it was quick enough to keep up with a TF 160 so could be quite interesting in another car. I know Rover MG used a 1.8 120HP version in some models why not the 135 or 160.

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