I have a 1985 ford bronco that want start! i have fuel,ihave spark,ihave correct timming marks. i have a new coil,new battery,new starter, new fuel pressure regulator and it want start?

Have you done any work on the timing or plugs lately? Are you sure the plug wires are on in the correct order? If you replaced the timing chain then your marks could be lined up but you could still be out 180 degrees. The cam makes 2 full turns to 1 on the crank. You will have to take the valve cover off and turn the engine over and be sure that the intake is closing and the exhaust is opening, not the other way around. Check your rotor button and see where it is. If it's not lined up with #1 then you'll have to pull it out and move it?
If it was working and you shut it off and it won't start, then set you time and check the rotor button. If it's off by a tooth or so then chances are its jumped her time and you'll have to replace the chain.
Hope this helps.