Re: Carb advice - 1991 CVPI 5.8L
Ask for a Motorcraft 2150 for an '81 Thunderbird. You could just rebuild it, though, I did it and it's really not all that difficult.
Check out my Car Domain page for the writeup I did on it.
1989 Ford Crown Victoria Police Interceptor
2bbl Carbureted 351W V8, ported and polished E7TE heads, Edelbrock cam
AOD Transmission with B&M Shift Kit
3.55:1 Positraction Rear Axle
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