brake problem after booster/master install

[70CHEVYBB]

I had a friend ask me to put on a power booster and master cylinder on his 48 ford. I found a 7" booster with a corvette master cylinder. I hooked up the rear brake line to the first port closest to the booster and the front brake line to the port farthest away from the booster. The master points to the rear of the truck. The problem is the front brakes lock up real easy. I am thinking I my have to reverse the brake lines. Any thoughts