You're stuck with other 88-91 Prelude engines unless you want to do some serious work. Since you have a carb'ed car, anything fuel injected is going to require a total rework of the fuel system and engine electrical system.
I would also suggest getting a different car if you want to swap.
Originally Posted by 98preludeSH
you could swap into it is a B20 single cam out of the 3rd gen 2.0 si.
Those where dual cam.