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Kevin,
Please let the other readers know howto test for a plugged CAT
 

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Discussion Starter · #6 ·
In order to test for a restricted exhaust system, connect a vacuum guage (autozone has them for 24.99), to a manifold vacuum source. Increase the engine speed to 2000 RPMs. Watch the vacuum reading. If the vacuum steadily decreases, then the exhaust system is likely restricted.
 

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Engine vac is measured form the intake manifold or base plate of your carb (not the same port used for vac adv distributor).
http://www.fordforumsonline.com/forum/members/6dsick-albums-new-stuff-picture382-vac-set-20hg.html
A normal vac reading should be around a steady 15-20Hg (Hg=inches of mercury not PSI) for an engine with a factory spec cam shaft. With a bigger cam the reading will be lower and lobbing.

For a fuel injected motor, you should be able to find a vac port somewhere on the manifold, usually near the brake booster port.
 
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