If you've got a carb it will definitely be a single point system. Tinley Tech do a suitable mixer for a 4 barrel Holley (see the first one on this page http://www.tinleytech.co.uk/acatalog/Mi ... stems.html
) but you'll need a vaporiser that is up to the job, such as an OMVL R90E. Alternatively you could go for a complete Impco system that is specifically made for big American V8 engines, although not cheap. Depending on what system you already have and what car it came off, you may not be able to reuse any of it. You certainly can't use a 2002 tank.