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Fuel pump info, it is a GM high performance unit, I think around 1964 or 1965 was the first year these were used on 365 and 375 H.P. 327 engines. The casting is a little different then the 1965 unit.

"Can be used on all Chevrolet 283-400ci V8 engines. Pump has 7 psi shutoff pressure, 3/8-18 inlet and outlet ports and has a free flow rating of 110 gallons per hour. Technical Notes: 6.5 to 8 psi at 1800 rpm."

Note: The above 2 inch carb spacer adds a little more then 10 HP, over a non spacer engine. It adds more HP/ Torque then a one inch. The 2 inch is about 4 HP more over the 1" spacer. If interested I can look up the torque increase too.