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I have a BBC that is driving me crazy. The engine serial number says it's a '79 402 and in checking the head casting numbers they are for either a '72 402 or 454. I was told that the engine was a 454. In checking the back of the block there are 2 sets of figures. To one side there is ONV and a little ways away is GM10T. There are no other numbers I can find. The engine number is T0505TLM.
 

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You need to get the casting number off the rear of the block, probably on the drivers side on the bell housing lip. It's a six or seven digit raised number with no letters.

Have you been to MORTEC's site? It will show you where to look and has some codes as well.

http://www.mortec.com/
 
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