A stereo with Android auto/CarPlay and a backup camera are both easy and readily available. I currently have the Alpine ILX-W650 which is very affordable ($300) and works fine with no lag. I would recommend you stick to name brands like Alpine, Kenwood, Pioneer and you should have no problems...
I have a couple of questions, most importantly do you happen to live in the Chicago area as I could certainly assist?
Getting to the car, I’m sorry to say I searched through my Chiltons manual and was surprised to find no information on machining specs for the engine. Did the machine shop say...