Carburettor issues

The carb should not run dry over being off angle by a few degrees? In theory I could see that the float might sit a little high or low, but it shouldn't run dry... That seems more likely to be a fuel flow issue, as long uphill stretches, outside of track use, are probably when you'd use the most prolonged large throttle openings and therefore fuel use. Are the filters clean, and the pump up to the job?

Is the gasket that seals the float level when the carb is fitted to the car? This is normally a good indicator of the angle the carb was intended to be mounted at.

I can't help with the right material to insult the carb to avoid heat soak. Though, if the car is running lean due to fuel starvation the whole engine may be running on the hot side and causing your vapour lock issues. I was suffering with some vapour lock on hot days in summer in my Daimler, and ultimately switching to a cooler thermostat solved the issue.

Aluminium is a pretty good thermal conductor, and the gold tape won't do much to stop that I suppose. I may be wrong, but I think reflection only works at surfaces and not in between two solid materials?

A piece of hard wood is cheap/ free, easy to machine and insulates very well.

Thank you for your reply. Well the issue of fuel starvation only happens when accelerating up a hill and not when accelerating on the flat. This issue has only started since changing the engine angle to overcome another issue. I have an electric fuel pump next to the fuel tank in the rear. the fuel is boiling away from the carb when the engine is switched off when hot. I am assuming this is the issue for poor starting.

For the fuel the best thing is to fit a return line, as others have said i'm suprised a small change in angle had had an effect, can you turn the carb 180 degrees or raise the float level slightly?