[steve25]

So you have posted that the 3/8” steel fuel Line along with rubber and clamps from the tank to the carb are new, but what size is the tube in the new tank pick up you put in, is that 3/8” also?

[62posbonny]

Everyone here is right with the suggestion of fuel delivery. We ran into the same on a 9.2:1 RA4 cammed 455 in a 64 Catalina. Car stumbled at the top of 2nd gear and you could see AFR go dead lean. On top of that, AFR was lean throughout the range at around 14.5 @ WOT. Switched to an in tank pump and new lines, regulated to 6psi and initially ran vac line to the regulator. Carb was still lean but didnt run out of fuel. We then tried a flat 6psi with no vac reduction and the Cliff quadrajet hit 12.9 at WOT and the engine pulled far better than it ever had. We had to lean out the APT a little but with all of that done it's a beast and drives amazingly. he is running a relay box that primes the pump 3 seconds on key on then only runs the pump when it gets tach signal. whole system is great.

[DaleO]

Originally Posted by steve25

So you have posted that the 3/8” steel fuel Line along with rubber and clamps from the tank to the carb are new, but what size is the tube in the new tank pick up you put in, is that 3/8” also?

It is 3/8".