Sounds like you got a great deal. What you should do if know what you want out of the engine. you will want stock leanth hardened pushrods with welded tips, as for rockers they can get very pricey. up to 300 dollars for a set of rollers. so that all depends on what you want to spend. A good set of roller tip long slot rockers can add up to 20 or so HP and dont cost more than 80 dollars from summit and I have seen them on ebay brand new for 60,and they come complete with new nuts. As for a carb, anything over a 750 could be to much carb for that engine so no need to go more than that. And even if you go larger than that you dont need to run any type of special fuel but some are ste up to run alcohol, so keep you eyes open for that as I am going to bet you wont need one of those. You only worry about fuel if the engine has a compression ratio over 10 to 1 then you will need the highest octain you can find and then some. For most good running street engines 9.5 to 1 will work damn good and still use pump gas. No matter what you want to do with it you have to be realistic with it. do you want to drive it daily? or build a weekend racer that stays parked most of the time. Slow down and think it thru, ask a lot of questions. This is a good place to do that or go to
www.thirdgen.org there you will find a ton of info.