Just installed Summit Racing full headers on 66 Mustang with 302. On the front of the driver side frame rail where the fuel line bends out there is approximately 1/4 inch clearance from the header tube. Is this a problem?
Very well could be. We go to some length to keep the fuel from boiling in the float bowls after a shut down, and introducing pre-heated fuel into the mix might be a problem. I'd just re-route the fuel line and keep it as far as possible from the headers as possible.