Thanks guys. I did find the general torque tables in ssp-1776 finally, however I still don't know exactly the size and thread of the oil plug though I'm sure I can get that eventually.
I found the procedure for seating the oil suction screen in an online manual for another model of IO-360 on the Lycoming website - it requires seating it finger tight plus 135 degrees. Must be an NPT type thread.
If I were writing the owner operators manual, Lycoming, I'd at least make some of this info more accessible since you are selling these things to rank amateurs like me
PS just saw your comment Brian - not NPT on the screen but a crush washer - got it now thanks.