Help on Power Booster problem

[Jakes-66-K10]

I upgraded from a manual master cylinder and drum front end to this new power booster (3/4 ton for my truck) and I think this is the one final problem I am having with my disc conversion.

This isn't normal for a booster rod, to sit right up against the firewall like this, is it? I'm worried maybe it needs spacers or something. My brakes feel fine (in fact GREAT compared to what they used to be!) but just wondering if leaving this booster rod like this could be causing drag by slight pressure on the brakes.

If this isn't normal, how to you adjust the end point on the booster? I know the pedal has an adjuster, but don't know of anything else. Any pics of what it should look like what also be helpful.