Orange box or....?

If you look at the two box pictures right off the bat you see no markings on the tall transistor, so they just have a small board inside them. Just FYI. I have tested a bunch of the hi rev and they seem better than most out there. As for a vacuum advance adjustability it is just the rate of advance not the amount so you still need one with the proper amount of advance. FBO plates are great for limiting mechanical advance but will not add any, but you need to figure out what curve you need and change the springs as needed for when it goes in also. Hope it helps. The firecore does use the same Mallory style advance system like some MP's did and the total can be adjusted.