A few questions..
 

got some money saved up from my summer job so i'm plannin on puttin it all back in the stang, i want plugs and plug wires but idk the right brand, and if anyone and a few affordable simple power adder suggestions that'd help.. oh and how hard is it to install new rear end gears?

https://mustangboards.com/general-te...ar-thread.html
it seems that everyone asks gear ratio questions (including me) here is the official gear thread in general tech

4.10's+T-Lock.

thanks for the link, but i got to looking on am and saw the sct xcal. and the diablo tuners, but which one is better? and aslo whats the best brand for plugs & wires?

For the spark plugs just get whatever cheaper plugs work like autolites or NGK those exspensive plugs wont make your car faster. Same goes for plug wires.