Got lucky with my 90 GT Mustang, My boss seen it in the classifieds. It was about 2 blocks from my work and add said it had a T5 six speed, and a Vortech.  Turns out it had a T56 sixspeed and A-trim.  After some pulley and fuel upgrades was running 405hp and running 11.84s.  But the engine let go so I upgraded.  360 Dart block, Edelbrock victor jr heads, Scat crank, Oliver rods, Compcam Soild roller, Upgraded my A-trim to Si-trim vortech, Racecraft K-member and front suspension, Strange struts and shocks, Umi upper control arms, Maximum Motorsports lower contol arms, Trutrack diff, 3.73s.  I built a 4R70 with a FB trans valvebody, Precision Industries converter, 10pt cage, Brian Black control panel and switch panel, full line of autometer gauges, Msd 7531.