When you build or put together a car - muscle car , its easy to overlook fuel line diameter . Project 69 mach 1 m code transformation , no motor or tranny 351 4v is now 428 5 speed car with upgraded fuel line size , thanks to the forum and Barry for the post . I used the stock fuel line not knowing until reading the forum . Part of my car not running to my liking was the line , pick up and delivery to the carb .. Still going to change the cam to a more aggressive profile and install the detroit locker and 3.70 s but im on the right path now many thanks guyb s .. Bud