If, as you say the heater is there, then it's just pipe work (plus a good flush out).
Reading the description and allowing for the condition underneath / the 'outrigger' mentioned in the advert, you may even be able to drive her home.
Plus, lets face it, if you love Morris Minors, the you must enjoy the occasional challenge.
Would I?
Well if I wasn't busy putting Sally back in the road, something that (as always) will take longer than planned, I would certainly go and have a look.
Best wishes,
Mike.