sloppy steering

I just got the stang back from the dyno and I have a few issues with the steering I need help on. Its a 90gt and when I start it up the engine has so much torque at idle that it bangs into the steering shaft. Will poly. motor mounts fix this problem? Also what about a torque link from the head to the frame. If I pull it into the garage the wheel is really sloppy(alot of free play in it). I know the bangin feeling that I have is the shaft hitting the header. Is there any tricks to keep it from hitting the header and also tighting up the steering in it.

It has a tube k-memeber, new pump,off set bushings, flaming river shaft.
Dont want to dent the headers they are on the car now and they are ceramic coated. please help
Wont be a daily driver but will be driven on nice days as long as gas doesnt run me broke...

okay maybe so much torque was the wrong word. It has a big cam in it and at idle the engine shakes badly. the motor mounts are new but just stock replacements. Do poly. mounts make it a rough ride or is it bearable as compared to soild mounts. What about the freeplay Im having in the steering wheel. The shaft is a u-jonit solid piece that bolts directly to the rack.