[Oldsguy]

What Texasred said........I would comment that a nice aftermarket manifold for that big block would be an Edelbrock O4b if you can find one, they are available on Ebay often. I have one on my 455 in my Delta and it is a good street manifold, develops good vacumm and is better than a stock iron manifold. I am not going to make any recommendations on carburetors because everyone has their favorite but a 4150 800 cfm Holley, an EDL-1413 EPS800 Edelbrock, a Road Demon by Barry Grant or the venerable Qaudrajet by Rochester. Juse make sure you get a manifold that matches the carb or vice versa, square bore to square bore or spread bore to spread bore. Good luck!
BTW a quick way to identify a 350 or 455 is to look for the oil fill tube in the front to the left of the timing chain cover. Also the water bypass in the thermostat housing from the front of the thermostat to the top of the water pump (small diameter hose or pipe) shaped like an upside down J about six inches long. Finally looking for the letter in big blocks or number in small blocks on the left lower side of each head, drivers side would be front under the alternator facing the inner fender low, passenger side hard to see especially with A/C cars but near the tranny dipstick near the firewall facing the inner fender low.