The frame under that car is a unibody. So you might be able to fine replacement sections that simply bolt on to the rest of the car. The "frames" that holds engine, suspension, and so on are either subframes or torque boxes. I know that in the 2.0 turbo the front subframe is in sections and the engine and granny are the cross-member. You might get lucky with finding a good used subframe out of a junk yard. And its probably going to be a do it yourself type of job because do to certain liabilities some shops won't do structural rapairs of any kind. I'm having similar troubles with my 89 Sunbird gt with the 2.0 turbo.