Troy- You're right, the 540510 has a provision for the pump-interface. But it also has the 1/2" NPT tapped hole for heater-hose/guage-sender.
As for the 535552 being "SD", I'm skeptical. But you need to understand that the whole subject of "Super Duty" nomenclature prior to 1962 is a pet peeve of mine.
__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926} 
|