37 not starting

[Ggmac]

It can be challenging getting use to the sequence needed to start the old ones . If you can post a picture of the engine , it could help . Lets start with , what is a long time ? Did you turn the ignition switch on , pull choke out and crank ? How much fuel in the tank ? Can you see fuel in the fuel pump assembly? Did your dad have an electric fuel pump wired in for when it sat long ?
If your battery is fully charged and it cranks , the next srep would be to remove a plug wire and hold about 1/8” away from the block and have someone crank the motor. Be CAREFUL, DO NOT have any fuel nearby, be careful near the fan and hold the wire with insulated pliers . You should have a strong blue spark . If not we need to check some other ignition related tests