New Build Startup Issue

Sounds like you're on the way to a running engine. Let us know how the start up goes this time!!
Tried to fire it up again and it lit, but I couldn’t get the rpms up to start the fun. After about 5 seconds or so, I shut it down and added more advance. Then, one pump and turned the key and it fired up again. It ran rough for the first 10 seconds or so as I kept trying to get the rpm’s up. A few more seconds went by and it started smoothing out and up past 2k. Now I started the 25 minute counter. It finished the 25 minutes and I turned it off at 2300rpms and it dieselled a second then backfired out the exhaust.
The only leak so far was the brake master cylinder. No clue why except I may have topped it off sometime in the last two and a half years while waiting to get this engine back together.

Mainly kept it at 2300rpms while slowly blipping it to 2800 or so every once in a while as I was watching for issues.
At a warmed up 2300rpms, it showed 50psi oil, 22” vacuum (steady/solid), and never got hot on the gauge.
The 2300rpms started out at 46 degrees timing but I got it adjusted down to 32 for most of the run.
Waiting on it to cool down now so I can pull the valve covers and check the lash. If that looks good, then I’ll put in the inner valve springs and break it in again for another 20 minutes then bring it down to idle and start working on the timing and carb.
I think there is still a timing issue but I’ll recheck it after the next break in.
Thanks everyone!