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Your best bet is to get a carburetor you can tune with primary metering rod and jet changes and tune it using a wide band air fuel ratio meter, vacuum gauge and tachometer.
No accelerator pump will make it very difficult to start the engine.
I tried unhooking my accelerator pump linkage once and it really hurt drive ability with out an accelerator pump an automotive carb just sucks. The main reason you have accelerator pumps is to transition between idle and load.
There are 2 ways to calibrate the accelerator, change nozzle size or move the linkage, so its not a total waste of fuel. Altho my A/F goes to 11:1 for a few seconds when I step on it. With out an accelerator pump my car would just stall when given more air with out fuel.
I am sure a properly tuned carb can get as much as 15% to 20% better fuel economy than one that is just taken out of a box and slapped on the engine and run.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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