If you have a real 9.5-1 comp in your engine they work fine.( the latest 114 c/l version works better) The newer Comp XE cams or Lunati VooDoo series are a better choice for all around street use.The newer fast ramp cams really beat them up in the low and mid range where most street geared , mild torq converter cars run. A 2600-2800 rpm converter is more than enough with the 3:55.For most cars the 280 / 470 MP cam is a better choice if you want to stay with the MP cams.