1988 Jeep Cherokee Over Heated the engine

First took vehicle to professional waste of 75.00 told me nothing glad to take my money though
Next did compression test myself much lower numbers number 3 cylinder did not respond to using oil during compression test decided it was valves decided to change head went to pick n pull found exceptional 89 approx. 130,000 miles on head head had been rebuilt also got hydraulic lifters and push rods brought home and installed my valves still look good but not as clean 280,000 miles and the 89 had concentric valve springs instead of standard valve springs during disassembly noticed number 3 & 4 fuel injectors looked clogged (plastic melted over orifice)
cleaned as best as possible also hydraulic lifters were severely worn on contact surface with cam
Piston cylinders looked good and measured 3.875 average replaced hydraulic lifters push rods head reassembled and runs like a champ again unsure what exactly problem was but running good again probably need to tear down again and replace all bearings, cam, cam bearings push rod bearings, crank bearing, rear main seal, timing set but now have time to accumulate parts
Suggestions recommendations
Till next time have a good one and keep on keepen on from lonestar5966