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Should have the T1A340RS1A (or similar) engine with single plug heads. Serial number starts with a 2. 1973 EXT 340 had the T7A340RX engines with twin plug heads. All the 1973 EXT engines are twin plug heads and so is the Formula 2 290. Serial number on 73's starts with a three. None of the original 1972 EXT engines were twin plug, even the triples were single plugs. But a lot of the 1972 EXT's got raced into later years and updated with newer engines. Cat even had manuals that gave tips on how to do it. It's up to the restorer to decide how far he wants to take the sled back.

My .02. Have a happy...
 
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