I have a 1976 chevy monza towne coupe. It was one of the rare ones that came out of the factory with a 305 two barrel. Well i replaced it with a 350 Four barrel. Ever since I did that , if you hammer down on it , about the time it reaches 6000 rpms its acts like it has sucked the bowl dry. It cuts out and you kinda have to tap it to get it going again. I had a 600 holly Q-jet replacement on the car. It was a single pumper but it was a duel feed. I replaced the factory fuel pump with a high output holley electric fuel pump and that didnt help any. So i changed out the holly carb with a Q-jet four barrel I had laying around ( i had it rebuilt first) and now it cuts out around 5500-6000 some times 4500. With the randomness of the cut out could I possible have a collapsed rubber fuel line? because there is rubber leading into the metal line I just havent botherd to change them because the fuel lines on that car are EXTREMELY hard to get to . Any thoughts?