Brakes feel like they don't engage until almost to the floor

[Nodnarb76]

Now that I have my LS Swap done, I am ready to turn my attention to an area that has been needing some attention for a while, my brakes.

4 years ago when I bought my 87 R20 Suburban, I replaced the booster and master cylinder because the brakes felt a little soft. When my friend replaced the booster, he had a hard time getting the pedal right and ever since then the brakes would only engage once the pedal is almost to the floor. Last week I started to revisit my brakes and started by replacing the master cylinder. I still have the same issue of the brakes engaging almost at the end of pedal travel. Is there an adjustment on the booster? If so, how do I do it?