small block intake

Sorry I don't have a casting number cross ref. but I can say that if it's a stock cast iron intake there were only about 3-4 different ones made. Early 273 intakes that only fit 64-66 273 engines and were square bore intakes. Then there is a square bore intake made for 68-70 340's. In 71 the 340 came out with a thermoquad so it's a spread bore intake and basically the same intake used on later 4 barrel model 360's except it had an egr valve. What carb is on it? What year truck? What year engine? More info would sure help alot.