I am reconditioning a '49 Burb for which I obtained a GMC 270 of '56 or 57 manufacture. It is all there except the carb. I have not heard it run. The person from whom I bought it said it came out of a running machine (they all do, don't they?) I will be using a 292 so the 270 is extra. Can anybody give me an idea what it might be worth?