I recently picked up a 64 283 punched .060 mains and rods .010 1970 307 heads that have been rebuilt mild cam and it has an old holly 4bbl on it the only numbers i can find on it are on the secondary butterfly it sais 487 it looks like a small carb just wondering about a possible rebuild kit or if i should just toss it and get a new eddlebrock never been much of a holly person but if it will work i am good with it. thank for any info