First of thier should not be any rubber fuel lines under the hood. It was probley a vacum hose and that would indicate, to me, that you have a vacum leak somewhere.
Clamping it wont raise the pressure. At idle 41-42psi is normal, under heavy loads it raises it self through the vacum.
Heres a pic that explains the coils and how to test them.
Testing the HEI ignition coil
Also here is the page that it came from might find some helpful info.
autozone
Hope that helps!