I don't know if this will help, but here goes...
I had to drop a 1.5 crate engine from Japan into my ex's '88 Sentra after she killed the old mill. Was told to get a 5/16 freeze plug and plug the exhaust port in the 52A head which went through the head between cylinders 2 and 3, from the exhaust side to the intake side. I did that and got the engine running, but it was leaking antifreeze from the head and overheating. Found out there was a 3/32-inch hole next to #3 intake port which went into the water jacket, so I removed the manifold, put a self-tapping screw in the hole, ground out a small spot on the intake manifold to clear the screw, sealed the puddin' out of the intake gaskets, reassembled it and all was good.
And then the head gasket blew.
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Later, taters; Off to a better place. Catch me there!
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