The port on top of the block next to the knock sensor by the timing window. This is not present on a carb block, nor is the breather plate in back. You would eliminate this tee.

So I pulled the engine last night and put it up on a stand. I'm hoping to dive in and see what is keeping it from turning over. I feel like it could be rusty rings cuz the HG is blown, rather than a bearing or something seized. The oil i drained out looked pretty clean (no metallic grit, burnt smell or watery) Any advise on how to free up a piston with the head off? I'm going to pull the heads and work my way inward in hopes of figuring it all out. PB blaster has been pretty good to me so far. Thanks for your input in advance -matt

The cylinder could be hydrolocked with standing coolant in the cylinder. It may turn free once you pull the head.

The spark plugs are all out though, so that rules out hydrolock right?