"One-way" fuel line valve..?

I am 61 years old and have owned a lot of carbed - US and european - cars in my life.
None started the same way and I had to find the best procedure to start (hot or cold) for each one.
But with modern injected cars which start immediately, we got bad habits.
I probably forgot that carbed cars are capricious :p

Anyway, if a forum member who own a fully stock slant-six 1bbl carb can share his cold starting exprience, I'll be glad to read him

:thankyou:all