hey all i am pretty new to classic cars so seeking advise and help. I have a base model 289 4v cougar 3 speed auto with p/s. It is all original down to the single exhaust system. I would like to do a full restoration in the future, but for now am just researching options and ideas. the main use for the car will be a cruiser, something reliable to cruise all of route 66 once it is finished, however I would like to have some decent power out of it. it wont ever see a drag strip so really all I want is something that is responsive when I hit the gas, sounds incredible, and can at least not be bullied hard by the more modern cars. at the time of restoration I am unsure if i want to keep the car original and rebuild the 289 and squeeze as much performance from it as I can, or to make a GT clone and drop in a stroked 390. I understand that keeping the original engine will obviously be cheaper, but if i am tearing it down completely anyways, I might as well put in what I want. with both the 289 or the 390 I would want power steering, and air conditioning. power breaks would be great too. what kind of challenges can I expect to face, and what are some realistic power levels I can get from both engines? thanks for your help!