You should be good. 93 was the first year of the 405hp 4 bolt main bearing engine with a multitude of upgrades over the original 90-92 375hp engine. I’ve never heard of a “running change†type transition for this engine update. It was a hard “model year†changeover.
This will give you a better idea.
http://www.zr1netregistry.com/Inform...gineSpecs.aspx
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