Trouble starting in park.

Hello all, I’ve ironed out all the issues in my 74 dart except for one that I have yet to put my finger on. Sometimes when I attempt to start the car nothing happens, if I put it in neutral that will fix my issue and the car will start but sometimes I have to put the car in reverse, hold the key in the start position and slam the colum into park to get it to crank. I’m assuming it’s some sort of park safety switch or something like that. Anyone had this issue? Thoughts, tips?