1985 Mazda RX7 acceleration/power issues

1985 Mazda RX7 mileage: 150,000. I see that other people asking questions have had acceleration/power issues. I'm not sure if my problem is different. I bought the car new in 1985 in Canada, and installed a Rotary Engineering high performance exhaust system in 1989. In 1998, I relocated to Connecticut and had to install a (new) stock exhaust again to pass emission testing. I also had intake problems that seemed to be solved with a new shutter coasting valve, valve diaphragm, and fuel filter. At the same time, I also replaced the clutch. However, now I have no acceleration. I can accelerate to redline in second gear without moving faster than 10 mph. The shop that did the work (on everything except the exhaust) assures me that the clutch is fine, and they sounded like they were grasping at straws when they suggested a compression test, so I declined (besides, I was convinced they were bleeding me financially). And if that wasn't enough, it is starting to drop oil - about a cup every 6 weeks (I'm not driving it, so it's easy to measure). So I have 2 questions: 1. Any ideas as to the problem? 2. Know any good rotary mechanics around or near Fairfield County in Connecticut (other than the ONE Mazda dealership)?