Running out of fuel at 40-45 mph.

[1970pelle]

Looking back on this and all that was done and checked and rechecked. I never actually put my finger on the root cause.
Here is what I did that finally fixed it. I replaced a few new parts with different new parts.

1 Replaced the Edelbrock 1406 4bbl 600 cfm carb, after installing the edelbrock calibration kit and swapping around everything internal. With no change in my complaint, I did manage to have a highly tuned carb.

The replacement was a Quick Fuel Brawler 650 cfm carb. I'm telling you very impressed with the out of the box performance this carb gave me. Very easy to get it set up. Choke engine speed screw easy to get to and adjust. Idle speed settings easy to adjust, but needed to add lock tight to this screw it kept backing off loosing base idle. I will buy this brand carb again for sure.

https://www.summitracing.com/parts/q...7255/overview/

2 I also change out the intake manifold at the same time. Going with a Edelbrock Preformer Air Gap intake. This intake made a noticeable improvement in highway speed roll on performance.

3 Carter Mech. fuel pump that pumps 120 gph, #180-M4891 (Jegs)

4 engine timing I finally was happy with 30 degrees before TDC at 2000 rpm. I think I had 2 turns out on the vacuum advance. It was making 16 inches of vacuum at idle. And recovered quickly.

But that's what I did and my fuel starving issue went away. I thought I was chasing fuel that was being boiled and evaporating. But spark plugs where telling me not enough fuel. And all this was happening at high ambient temps. It was really hot that summer and early also.

Ken