Gets hot and stalls out

TrailBeast said
Note that I am in AZ.
I run a Holley 770 on my magnum.
3/8 lines up and back for a return system with both lines routed up the corner of the firewall and inner fender insulated then across to attach to a flipped backwards
dual fuel feed hard line.
My return T is right before the hard line that screws on the carb bowls.
I put a gauge in the main feed and a restriction orifice in the return to give 7 pounds at the carb. (no regulator)
I run an electric pump, but see that you use the mechanical, so obviously you pretty much have to have the pump to carb line up front in all that heat.

If you put a return type filter on it you will want to put it as close to the carb as possible to get as much of that hot fuel out of the main feed as possible before it goes into the carb.

The return will very likely solve hot fuel and possible vapor lock issues, but it sounds like you also have an electrical problem somewhere caused by temperature.

Noted, though the summer temps and shade in Phoenix are a bit different than Flagstaff or even Kayenta, so I'm not sure if you're stupid-hot in the summers like us or more human-compatible. (I used to live in Farmington, NM, and love Sedona!)

OK, so it really looks like a return system along with shielding the fuel lines will really help with any fuel boil or evaporation regardless of a FI system or a carb, so a good place to start. I also need to know where my timing is, though at this point that'll just be data and I'll need help understanding what that means. But I want to go to your statement about electrical caused by temp, because based on the conversation the temps seem to be the root of the problem (high temp causes fuel boil, vapor lock, possible expansion in the coil and distributor, i.e. electrical problems). It seems to me that getting the temps down into more of a 190* range will help resolve, if not solve, a lot of the other problems. Am I right in that line of thought? If so, shouldn't the vast part of the initial effort be to get the heat knocked down first and see how the motor reacts before chasing down issues that may resolve from that?