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It's an 85 berlinetta...it's GONNA be flat in acceleration. Check your timing and make sure the secondaries open up all the way. As long as the brake booster pump is connected to the upper vacuum and all the other vacuum nipples are either plugged or have an accessory attached then you should be fine there.
It's just an old car with an equally old engine... best bet is to completely rebuild the engine if nothing else works. Might be just worn out.
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