The engine is already out on an engine stand smile

that's why I was thinking of replacing seals and freeze plugs. several of the freeze plugs in particular look distorted and corroded. good point on the drain cock.

I don't have a good way of knowing if there are many leaks ( besides the obvious ones) because I only ran it for 5 or 10 minutes before I pulled it out.

rear main and chain case are definitely leaking I know that much!
Tj