Rochester

The car is taking longer to start every year.

I've replaced the fuel pump and rebuilt the carb, sealed the well plugs etc. with no change.

After cranking for 15 - 20 seconds it starts and runs fine thereafter.

Thinking the gas is evaporating since they removed the additive to prevent evaporation from fuel.

Anyone installed a little inline electric fuel pump to bring up pressure before starting?

Not evaporating overnight but maybe after a month.

I haven't installled an e/fuel pump Ron, but your problem seems odd, to me anyway. Do you really feel fuel is not getting to the carb? 

Ever disconnect the hard line from the pump-to-carb (at the carb of course) and catch it in a jar to see what you're getting? 

What type of choke does your Rochester have, and is it working properly?

Steve

Here's only a thought. What filter in the carb do you have? SOME of them with the long paper filter have a flap that is on the end in the carb. It keeps pressure in the carb itself to assist in starting.