I didn't want to retrofit/modify everything to be able to run Ethanol like modern cars/trucks. I went with a new Spectra Premium tank GM55A which is made to original specs. Also replaced the cab filler neck (it was rusty), hoses and gas level sender (rust as well). To me, I think the previous owners (6 since 1993) used Ethanol gas and the truck sat idle a lot. The "gasahol" aged out and broke down to a water component hence the rust.
I forgot to mention in my last reply. My rebuilt Rochester B did run much better. Good idle and acceleration but poor on cold engine start-up after a week sitting. I replaced it with a rebuilt YF 2100S. I have the original 6 volt system and it doesn't take long for "Redhead" to fire up now.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
