getting close to firing

I built a very similar combo in 1999. I had that exact fan. It was not up to the task,even; with a shroud,and a hi-flo Milodon pump,and a Hi-flo stat.,and a 26inch OEM A/C rad. It wouldn't have any of it.An OEM, 7blade A/C fan with a Ford thermo-clutch has been doing it for me since then.
During cam break-in be very careful. Keep a running garden-hose handy, with a helper manning it, and the IR gun.Get the rpm up ASAP, check for leaks;especially fuel, give the dizzy a twist until the rpm maxs out. Forget about the exact timing until later.
Then relax a bit, for twenty minutes.
The #1 thing is to not have fuel leaks. If you have to shut it down, do it!

All the best to you and everyone else, during the break-in, and afterwards, keep it between the ditches;Yahoo! I love my 367 cuber.

BTW;you do realize that you are running a double bypass;right? I think that won't work with that fan. I'm not even sure it will work with any fan.You are sending a double helping of hot water back into the pump, for a second trip. And a third. And a fourth. As many times as it takes, until the stat opens up. And also after that.With the vehicle stopped,the Eddies and Headers put a tremendous amount of heat under the hood.Then without a shroud,and the hood closed, there is no way that itty-bitty fan can move it all out, in addition to trying to pull air through the rad.You will find travelling at under about 30mph very frustrating and dangerous, as you keep checking the temp gauge, instead of watching traffic.I'd say trust me on this, but it sounds condescending, and that's the last thing in the world I want to sound like.
I ended up restricting my OEM bypass,quite a bit,to achieve good cooling. She ran pretty hot for awhile, but the KB-107s survived.I now run it at 205*F. I have had Zero overheating issues since I pulled that fan off, and made those,above, mods.I really, really wanted to run that fan.