How much should I expect to pay for fixing my in-line 6 engine and add performance parts?
Sadly not too many performance parts were available for that little 170 cubic inch 6cyl. JC Whitney.com seems to be able to come up with unusual parts. Even though I haven't looked there personally for individual application. They do offer RV cams and headers and perhaps for your specific vehicle.
As far as power steering pup. Get on-line or eBay and look for the pump and bracket and steering gear from anything from a falcon to a mustang. However, that again is going to rob a little power off your engine as well.