As of the bolt on i feel you will have no problems as long as the intake and heads call for one another....what i DO KNOW is that you are going from an injection throttle body and will have to work out your carb linkage and you will also have to change up your fuel delivery system..more than likley it has an EFI made for this type injection from factory..you will have to convert to a carb friendly fuel pump.....This i know for sure..
Next biggest concern i would have is the Computer in that car..unsure of their configuration in 1991..its more than likely hot wired for a EFI set up. if so it will not recognize a carb..you have to have someone re-figure or by pass altogether ( not 100%).......i do not work on this type car or set up,,so i cannot give you anymore than that with your change over..
Brian