You could run an SVT or 3L with OBD-I
There is a little more modification work required then a normal swap of each respective type but nothing major.
The biggest fab work I can think of off the top of my head is the fuel rail work to run the new style injectors. You can't "safely" run your stock 17's on an SVT or 3L engine.
This work has been covered many times as folks have switched to the SVT or RLIM before.
