Been driving my 1956 Mercury Monterey (312ci) around quite a bit this summer.  On hot days, I have vapor lock issues.  Drives fine for about as long as I want it to, but after I turn it off, after it sits for 10 minutes or so, it won't start back up until it's cooled down.  It never gets too hot while driving - my temp gauge is only "C" and "H" but it never goes past the halfway mark in normal driving, even in sweltering hot weather.

My remedy so far has been to pour a small amount of fuel down the throat of the carb - I can hear it hiss and boil when I do this.  Pour a little, start it up, runs for a few seconds and dies . . . repeat 2-3 times and it'll finally start and keep running, then I'm good for the trip home.

I've troubleshooted and fixed vapor lock on other cars in the past, but still pretty new to the Y-block.  Original Holly teakettle carb, do I need a spacer between the carb and intake maybe?  Any common areas to check?  Thanks!