Hard to start after sitting

1976 Dodge D100 with an '89 318 Roller Engine with and Edelbrock 1406 4 bbl and Mopar Electronic Ignition and ballast resistor. Foam Dome Air Cleaner, evaporates the fuel out the top after sitting more than 24 hours, creating crank crank crank hard starts.

Now had a same year '89 318 roller (in a '89 D100) with the 1406 4 bbl converstion and manual fuel pump and the Mopar HEI Distributor and high powered E-Coil, no ballast resistor straight 12 volts to power it. This one has the small chrome top air cleaner for less evaporation. Always instant starts even after sitting for a few days
IMHO

The only way to tell if it is any one particular part would be to swap them from engine to engine ONE at a time to see if you can duplicate the hard start on the other engine.

There are so meny other things then the ignition system at play.