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91-94 OBD1 systems use (SCV) swirl control valves, also known as secondary butterflys.
91-94 use much more aggressive cam lift and duration than the 95-98.
91-94 OBD1 systems have the catylitic converter after the header collector.
91-94 KA's have one connector to the TPS, OBD2 engines use 2. OBD 2 95-98 systems butt the cat right up to the header essentially there is no collector.
(EDITED)Pentroof dome shape slightly changed in the 97-98 models.
There will be problems directly swapping the 98 to the 91 with a 91 ecu. The cam lobe and duration of the 98 on 91 ecu will have the car running rich,TPS won't function,distributor isn't the same, and will probably decrease HP. If swapping the 98 engine it would be best to retune the ecu, and use the 91TPS, distributor, mani, or splice the harness to use the 98 ecu as well. This way you can use a properlly tuned 98engine.
There are a few ways to use the newer engines and make different HP.
( I may have forgotten something, let me know)
This swap relatively costs a little over a grand.
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