My 1982 Subaru Brat has had engine problems before and I got those fixed but I noticed when I was putting in the spark plugs that it was cracked. Im trying to find a way to replace just the block itself cause all the other parts are still in great condition and running. If anybody knows anything I would appreciate the help.

What exactly is cracked, the head near the plug, the block? Can you post pics? If the block is cracked you can buy a running EA81 super cheap and overhaul it with any degree of upgrades you like.