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I'm running a holley 870 on my 440 and whenever I floor it quickly from idle, the vacuum drops down to 0, engine kinda bogs a bit, then takes off once it hits about 1500 rpms. All this is in the space of about half a second. No bogging or hessitation if I press the gas pedal slightly slower...

I had originally planned on reusing the stock fuel pump that came with my 440 motor out of a new yorker. But now I'm having second thoughts. I'd hate to drop $200 on a new fuel pump if I'm not going to notice any differience. Should I run the pump thats on it now, buy a new $40 cheapo one, or...