78 Corvette brake conundrum...

Helping a customer with his 1978 Corvette. We put four new brake hoses four new brake calipers 2 front rotors and bearings. Brand new master cylinder bench bleed. Vacuum bleed all the brakes starting with passenger rear ending with drivers front. Then to make double sure did a short gravity bleed on all four just to make sure. NO BRAKES...???...:BangHead:...