340 has a hard time starting when hot?

Just change it to EFI then you won't have that problem anymore durrr... lol just kidding

I've had fuel boiling issues a lot being at higher altitude and figured out ways to stop it or at least make it less severe. On the 360 in my '70 Duster I have a non-Air Gap RPM intake (runs a bit hotter than an Air Gap but temps are much more consistent and it's better behaved in winter) and Eddy Al heads so no exhaust crossover, also one of the newer Street Demon carbs with the plastic body like an old TQ and a 1/2" wood fiber spacer. I installed a fuel filter with the vapor return port but actually haven't really had a need to hook it up yet; also don't feel like running hard line all the way back to the tank lol. Just some food for thought.