My 78 has the J engine which is rated for 68hp vs 63hp for the E engine.
However browsing the GM Heritage center I only see the "J" engine code listed in 1978.
"J" was the vin code for the HO engine in 1978, before they switched to the "9" and "0" designations.
My 78 has the J engine which is rated for 63hp
But yeah I, E, J, 0, and 9 should all be interchangeable.
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