Here's where I stand, I'm pretty sure it's not the intake gasket. Replaced it twice and it looked like it was sealing. With the blower and intake off, the top of #4 valve looks considerably cleaner than the others. I think this also rules out the spark plug tubes. That only leaves valve seal or head bolt. There doesn't seem to be any oil where the head bolt goes into the intake port. So I'm leaning toward valve seal. If I get the spring compressor from Mancini or Detroit City, how much of a pain is this to do with the heads on?

When does this car start to become fun?