split port swap is a good place to start with a low budget. you can get most of the parts from the junk yard iirc. yea if you have the budget you could get a new v6 or any gt, that will always be faster. and then id say nitrous is you next best bet. everybody seems to be worried about spraying and detonation... no, if you go conservative (not a 250 shot on a stock motor) and get a good tune for it you should be fine. or if you got the money and rly want to keep that car. gears, f/i... etc. you can go a number of different routes with mustangs, its all about your budget and personal prefference.