If you want to solve any and or all fuel delivery issues you may be having, do yourself a favor. Order a fuel pump for a 73 SD (super duty) 455 T/A. This WILL bolt right up to any Pontiac block however, it has A MUCH LARGER fuel reservoir than a standard/typical Pontiac fuel pump. In addition, order the hard line that goes from the pump to the carb as well and it will look perfectly stock and you won't have to use rubber line etc.

A little trick I learned on my ole 400 in my Bird!