I have a 92 F150 woth a 302

I have a 92 F150 woth a 302 it ran fine no problems then it would have problems starting and running right ( wanted to spit and soder). so I changed spark plugs coil pack and the distributor cap and rotor button. now it won't start at all thought it was fuel pump checked it it's running fine I changed the fuel filter it's getting good gas. now my fuel relay wants to skip in the curcit and buzzes. it goes back and forth on that it will work fine then have problems running the fuel pump so I changed the relay and have the same problems. I crank the truck over and it just keeps cranking won't turn over.