I should have made a note of which motor I used. I did special order a higher end motor (Modine?) than the "offshore" generic model.
Some mfrs. show different #s for various applications (AC/no AC, HD/non HD, etc.) Other mfrs. supply one # for all applications.. Maybe the difference isn't so critical for the Chev applications, but of course is for the Jeep transplant.
My motor came w/ the drain hole.. I've heard that there are some out there that don't, but I haven't come across one. I plugged it w/ a plastic plug (the hole's a common size) and a little sealer.