the hole closest to the bolts where the trans mounts on. is that a freeze plug? not the small one, the bigger one

 

that breather box thing, or your can plug is and run some other kind of catch tank breather think, or it can be a drain back for a catch can....

 

PCV canister belongs there. why does it look like that?

 

its a b18a1 block so maybe it had a bigger box? ionno

 

is the hole treaded?

 

no. im thinking of buying a freeze plug then tapping it for an -an fitting so i can run the return line on my catch can

 

Just put a freeze plug in there. Take off the one with the Allan head to the right and use that as the line to your catch can. Also the one right on top of there also next to the oil filter. Here is an idea of where to look. Read through it and you'll know exactly what to do.

https://honda-tech.com/forums/all-motor-naturally-aspirated-44/oil-catch-can-installation-b20-vtec-2510617/