Starting issues

Bought daughter 65 barracuda and just fixed the electrical issues with some very knowledgeable folks . The car runs great when it starts good idle decent acceleration.
Being an older car it sometimes cranks for a while before it starts . I don't want her to have to call me to jump start her every other day . How do trouble shoot this. The engine is 273 two barrel completely stock 150,000 mile exhaust pipe is black so I guess it's running rich .fuel pump works carb was rebuilt a year ago but the car sat most of the time wasn't driven much . New regulator and alternator .

Thanks in advance