There are a number of stores and garages that stock the Edelbrock Performer Series carburetor. Sites such as Advance Auto Parts, Edelbrock and Amazon all stock the engine.
With the intake and carb you are running you are fine on flow. It's all in your carb adjustment. You may have the idle set too low, the floats too high and it's flooding out, could be the wrong size primary jet size. A lot of guys swear by them, but I never had much luck tuning an Edelbrock carb.
It depends, if you get the exact same carburetor, then no, but if say you upgrade from a single barrel carter to a 4 barrel edelbrock then yes, but if you already have a 4-barrel carb and manifold then you may need a adapter which is inexpensive, but you could also get lucky and it may bolt right up.
Several things could make a carburetor backfire. The engine could be out of time. the carburetor could have a stuck float, or the engine could have a stuck valve.
The oem is a Rochester Quadrajet, but you could also use a Holley, Carter or Edelbrock, among others. It would be best to pick a carb that you or someone you know and trust knows how to tune. In the alternative, buy a book on tuning the carb of your choice.
According to Autozone, there wasn't a 302 in 1981. It listed the V8 as a 4.2L = 255. It had a 2bbl carb on it. If it was modified, then it could have a 4bbl carb on it. One of the first things I did with my 82 GT was remove the original carb and intake and replaced with a new Edelbrock Performer dual plain intake and Edelbrock Performer carb 750 to match. It opened it right up, however no normal car needs a 750 carb. A 600 or 650 is optimum for these Mustangs. Here's some diagrams to get you started: http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528004df83
can i have a Yamaha xs 850 carburetor assembly diagram
Yes it could if you in fact have a carburetor. Carburetors were fazed out during the 1980's.
A Tecumseh Carburetor could be purchased from a variety of online retailers such as Amazon, eBay and SupaPrice. There are also helpful videos on YouTube showing how to undertake a rebuild of this kind of carburetor.
Could be in need of a tune up and/or a carburetor rebuild (accelerator pump failure).
Because your carburetor is not getting fuel to the engine - could be a plug in the fuel line or it could be dirt in the screen in the pick up tube in the carburetor. I would suggest you clean the carbutator.
You could allways add a better ignition. or even change to a higher ratio rocker arms. Hedders are a big help if you add a high flow exhaust. With out knowing how far you want to go with this you could even change heads, cam, compression. Just about any thing that will work on a 350 will work on a 305 but use modderation in picking your parts.
it could mean you need a new carburetor