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And even easier if the OP is going to remove the heads. @4wdHonky- if you have a bottom end bearing issue you could swap the NA block in for the turbo one AND swap the turbo pistons in at the same time. The bottom ends are all the same, just the pistons are different for lower compression partly due to lower grade fuels and crappy tuning in the 80’s and partly for boost being applied. Personally I’d try to keep the stock turbo engine running as it is if there aren’t any other issues other than the spark plug hole. Cheers Bennie

Repairing a stripped spark plug hole is a much smaller project than the other options... I haven't tried, but I've seen people do it in the vehicle and just blow the chips out afterwards.

Parts are out there, but they're not common at all. If it were me, I'd pull the turbo engine and keep it around. Then pull your NA EA81 and convert it to TBI using an EA82 SPFI intake and throttle body. There is documentation out there of how to do this but you'd be looking at a bit of work. Either way I'd say it's worth it, save these cars and SAVE YOUR PARTS! Good luck mate :]