[Rich-Tripower]

Body mount holes have a lot of room to play built into them. If you want to have the frame adjusted with the car all together, it would be best to loosen all the sheetmetal mounts prior to adjustment. Or better yet, pull the whole front clip off. You could just pull the radiator support and leave the fenders attached to the cowl to preserve your door/fender/cowl alignment. The amount the frame needs to move to restore spec and allow for a proper alignment isn't really that much. You may need a few more shims here and there but most if not all of the change should be able to be absorbed by the rubber body mounts' compliance. You are moving the frame horns out more than down and we are only talking about a movement of (probably) less than three-quarters of an inch.

Be aware that finding a shop with a frame machine and someone who knows how to use it can be tough nowadays and for you another problem is that the nice finish you probably already have on the frame will get scuffed up a bit. But that's easy enough to fix after the fact.