Need Brake help Please

['65 chevy lover]

I've been dealing with a broken hand for the last several months so, I took my truck to a Hot Rod Shop to have a few things finished. I had the front brakes (disk ) and power booster installed but, no brake lines. Got the truck back today and on the way home, got to really test the brakes. Brake feels pretty good until you have to get down on them a little then, pedal stops going down like it hits a stop or something.....Definately not right. Any suggestions as to what might be the problem? Thanks in advance for any help.