[PGSigns]

Post some pictures. Not sure if you meant 350 engine. There are numbers on the front left of the engine on the deck surface that can further refine your engine and this may make it easier to find a carb kit. Carb may be really lean as it should not take 5 pumps to get it to fire up. One should do it. Many things other than the carb can cause the issues you have including bad timing, bad distributor cap, burnt valves, and the list goes on. So take a good look at everything to get a good idea of the overall condition of your new ride. I have 40 series flow masters on my 66 and they sound like crap unless you run a cross over and that takes the bark out of them. I am getting ready to go to 2 into one with 2 1/2" pipe to the union and 3" out through a 50 series flow master. Saw this setup on an engine on my buddies dyno and it made good power and sound.
Jimmy