welcome to the site! sweet sixxer. my first mustang was a sixxer similar to yours. i still have it today nexted to my gt
alot of v6 guys work on the looks more than performance for v6's. nice new tint, mach grille, lowering springs, new widers wheels and tires, etc.. a nice exhaust and tune should give you that extra little kick ur looking for though. look around on mustang part sites like americanmuscle.com , latemodelrestoration.com, cjponyparts.com, etc.
if u got any questions ask away buddy!