Still love my car but......

The timing cover is almost going to have to come off. That bolt basically goes through an aluminum tube. The bolt is ferrous. The timing cover is aluminum. Over time the two corrode together. You have however thick the timing cover is of corroded bolt. It ain't gonna budge until you get that cover off. Then when you get it off, you need to get as close to the block as possible with a pipe wrench that has GOOD teeth on it, AFTER you have drenched the bolt where it goes into the block with PBlaster.

Oh and the timing cover "MIGHT NOT" live. Lots of times it takes cracking the timing cover along that tube where the bolt goes through to get it off, so be prepared to find another cover.

Once you finally get THAT mess apart, remember to coat the long bolts that go through the cover with high temp RTV not only on the threads, but also on the bolt shafts. "I" would also coat every single bolt that screws into that timing cover with RTV as well. That way, they will ALL come BACK OUT the next time it has to come apart.

Ever think about a recam or timing chain replacement.......or playing around with cam timing? NOW'S the time.