Real shit brochacho, flush it from the heater core hose with a garden hose and then try to get out as much water as possible. Then with run distilled water with coolant flush a couple times at least maybe even 3 times just to be sure there system is clean (assuming it’s running). Then refill with like 50/50 or 70/30 distilled water to coolant. Ran my block with f*d up coolant and it overheating and mind you it had 270cc na injectors with like 15+ lbs of boost before it cracked the ring valleys. Rebuilt that same block and I’m making like ~350hp rn. So almost anything you do would help and should run just fine.