This engine does not require any modifications at all. The Super Duty Engine is based on the original "Iron Duke" engine found in all Fieros and many GM models with 4 cyl. engines, for example S10's. It's favored among many 4 cyl race engines because of it's reliability. In fact all components are interchangable. This engine has beefier components becuse of HP ratings and higher RPM limits. If you want the transmission I will throw it in as well. (5 speed) Asking price is $3,200 (O.B.O) Currently sale is pending.