how much for this

Hi Greg1911,
Just changing the trigger and hammer in your gun is not going to change the trigger pull much if at all. The labor on the work you want done would be about $20.00 to $25.00 plus about $80.00 in good quality parts. My recommendation would save your money and have a complete trigger job done.
Regards, Bob Hunter www.huntercustoms.com

by the way this is for a 70's series gov. model what should I drop the pull to?

If you are using this as a carry or defense gun I would not go any lighter then 3.5 lbs. Most of my customers want a 4 to 4.5 on gun that might be used in self defense.
regards, Bob Hunter www.huntercustoms.com