Push rod replacement

[DrPhilgood]

If anyone can give any help please do.
I have a 67 Coupe with the 200 ci I6. I was lost acceleration and the engine was running rough. After some investigating Ive found a bent push rod in my number three cylinder. I have the replacement rod but Im a little nervous about getting it properly reinstalled. Do I need to use a feeler gage and tighten the rocker screw on the rod until the valve is at a certain gap? Do I just tighten it down with zero clearance and allow no turn on the rod? Or is it supposed to be able to move? Also, do I need to lube the push rod with grease or oil before dropping it in the cylinder? As you can see, I have avery limited understanding of this stuff. If anyone could dumb down some directions to me I would appreciate it. I dont want to screw it up and bend the new rod too. Someone, anyone please help, I cant find a good descriptive answer any where. Thanks.