hi !
Sorry for the delay....
The BSE bar stock engine is a 428 engine. Relatively new looking but would be at least 3 years old now.
The one with the Venturi and the Q-500 back plate actually looks like one of the newer 426 sport-jett Q-500 engines. Those are current engines.
Both should have a black muffler with them.
Drop me the photos in email if you can please?
Bob
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