A friend of mine has an 82 Lancia Zagato he uses for the street (when it's running). He has never had good brakes on the car, it takes a very high pedal pressure to just slow the thing down. He has had the booster rebuilt and it tests OK, replaced the master cylinder and converted to Fiat front calipers (one line vs two lines per cylinder). He gets good fluid flow at the bleeder and 17 inchs of vacuum at the booster.

We're running out of ideas. Any suggestions would be greatly appreciated.