[MA70-3.0GT]

I'd have said something as my motor was rebuilt by a shop, but before i bought the car with bhg (long story short they missed the blown heater core, gasket blew on first runup and owner scarpered!)

the engine has had a rebore, pistons/rings, mains & big ends, oil pump, water pump, belts, tensioner, recon. Head etc, the full works and i believe the guy owed the shop around 3 grand UK money when he vanished. I dont know if he paid anything off before that but i'd imagine that was just labour and the parts could easily have been another 3k with the head.
Imo youre best doing as much as possible yourself, otherwise you really need to ask whether you dont just want to do a jz or similar swap or buy another car that runs well.