That was THE worst job in the history of worst jobs. I got everything buttoned up, and after a quick warm-up run, noticed my petcock was leaking and there's a little bit of weeping around the fitting at the box. Figured since things warmed up a bit, it may be loose. Got another 1/2-1 turn into it when it was hot. I'll keep an eye on it
The petcock is par for the course, there's an O-ring there that doesn't seal well, so I'll worry on it tomorrow.
Think I've got this thing licked... Thanks again, all.