Part out sort of started yesterday, I got the car on the lift and warmed it up one last time to run compression and leak down checks. Cyl1 still seems to be the problem child and probably the reason for blowby like we discussed. It looks like it may be worse. I will be sure to take a good look at it when I get the head off.
Compression:
Cyl 1: 160
Cyl 2: 175
Cyl 3: 165
Cyl 4: 170
Leak down, leakage % @ 100psi:
Cyl 1: 15%
Cyl 2: ~0%
Cyl 3: ~0%
Cyl 4: ~0%
Not sure I feel good trying to sell the block like that, especially if it's actually getting worse. May have to just sell the rods/pistons, assuming they're ok, and figure something else out with the block.