I installed the Hellwig bar on my car in 2000. It was the BEST upgrade I did regarding handling. With the factory front bar, poly suspension, KYB shocks and 255x50x16's on all four corners, my '70 GTX lifts the inside rear wheel on an autocross course. I STRONGLY recommend the Hellwig bar.
Good luck,
I'll have to check out the Hellwig bar, I know nothing about them and this is a pretty strong endorsement. Nice car by the way!
I have installed frame connectors and torque boxes all poly bushings front and rear, .96 bars and HD leafs with an extra leaf installed and I'm running IAS shocks.
