89 octane Factory specs.
92 or 93 octane would be the best for that engine.
87 octane is recommended
87 octane
93 octane
87 octane.
the best fuel would be 91 octane or premieum.
Regular Unleaded 87 Octane is sufficient. Buying any higher octane is a waste of money and will provide no benefit.
" regular " unleaded - 87 octane
87 octane should run just fine.
The block itself will fit, and your best course of action will be to retain the electronic controls/engine computer and all electrical components from the 1997.
The best way is to siphon the old out and pour new in.
The 1993 Chevy Caprice is designed to run on regular unleaded gasoline with an octane rating of 87. Using a higher octane fuel may not provide any benefits in terms of performance or fuel efficiency. Stick with the manufacturer's recommendation for the best results.