Motor mounts (biscuit type)

The Schumaker bushed torque strap works great and you will never see it in an A Body with headers and power steering .
Can't speak to the fit with power steering. When Schumacher started making the interlocked mounts, he talked me into using the torque strap instead. It alone solved the broken motor and transmission bisquits. If fit with PS is an issue, there must be some work arounds, or the old school steel chain method.
As far as headers, it seems to me that depends on whether they run through the K. I can say the TTI shorties don't interfere there, and as far as I can see, neither should the Dougs or TTI long tubes.