You will need to change the Oil and filter, spark plugs, spark wires, fuel filter, air filter, oxygen sensor, thermostat, drain flush and refill the cooling system, and (if needed): change the breaks, rotate the tires, and change the Transmission Fluid.
How to change a timing chain in a 1998 Oldsmobile delta 88
Fuse 17 in a 1993 delta 88 Oldsmobile controls the air conditioner
you have a sensor problem.
Depends on the engine
The correct tire size for a convertible 1972 Oldsmobile Delta 88 Royale is 225/75 R15.
A motor from a 1991 Oldsmobile will fit into a 1996 Oldsmobile Delta 88. The motor mounts will need to be changed.