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The car runs good and burns no oil.
Then there's likely nothing fixable per se. You might have some varnished up injectors, and those can be sent to *Qualified* D-Jet service people- send 'em to an average injector place and they will melt them, as they take less current than modern injectors. But, you probably won't see a gain in power at all.
The compression difference is just outside what's acceptable, but I'd be willing to bet if you took an average of the b20's on the road in thier heyday in the late 70's that would be average.
Coolant is very unlikely to leak into both 1 & 4. D-jet initial cold running with a D cam tends to be ragged, but if it gets unusually bad, then you have a problem
Ian- 10 years on a $400 D-jet car starting with 173K miles in 1999. Still drive it to work every day.