Kframe, engine bay, front suspension questions

Spray it with a gun. A HVLP like you have will not produce much in the way of overspray, If you base/clear it it dries fast. I have about 10ft from my garage to the neighbors garage and did not have an issue when I sprayed my engine bay. I do have cool neighbors that do not complain about the work I do on the car so that does help.