My friend bought a 95 gt with 141,000 miles, he started spraying it right when he got it and now has 180,000+ miles. Not even any blow bye. And as far as performance goes i'd do 4.10's since your AODE. And buy suspension so when you have the vortech installed you can actually hook up. Example's U/L Control arms,Sub-Frames,Strange 10 way adjustable shocks,and some nice sticky tires MT's,BFG's or crappy nitto's.