Ive got an 03 5.3 lsx in My 85 foxbody mustang and it has the stock truck intake with returnless fuel rail with 3/8 pushlok feed line and afpr at the rear of the car. I'm looking to upgrade the fuel pump to a magnafuel 4303 and was wondering what feed and return to use with the stock truck rail?

 

I'm thinking the stock rails or push type fittings may be too restrictive, all I know is that with a -6 return I couldn't keep the fuel pressure under 70psi. I upgraded to a -10 feed and -8 return with aftermarket rails and all is well, set at 45psi at idle and boost referenced from there.

 

Do You have a link to aftermarket rails for the truck intake?