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Hey Randy, welcome to the site.

Do you happen to know the gear ratio of the rear end. You should be able to locate a tag bolted on the rear ends cover that would say something like; 2.76 on it.
If it's not there, a lock stock and bbl way to know is find the ratio on the ring gear. Look for it when you change out the rear ends fluid. Jack up the car, both wheels and rotate a wheel or the drive shaft by hand until you see the numbers on the rear. It'll like new gear oil anyway.
The reason I ask is not to over cam a numericaly low ratio car.
Cam choice and opinions will be wide and varied. Heres mine in case you have that 2.76 geared rear. The Comp Cams XE256H

Otherwise, I like 66dartgt suggestions. They make sense and are very good steps to follow.

I don't know what the prices for the said items are, but a good source would be Jegs. Click below; http://www.jegs.com/webapp/wcs/stores/servlet/TopCategoriesDisplay?storeId=10001&catalogId=10002

On what is a single plane and a dual. The Performer and Performer RPM is a dual plane, the TorkerII or Victor series are single planes. The single plane have an open area under the carb where all the cylinders conect. The dual plane is split in half. When you get to Jegs site, click the pictures of the manifolds to see better.
The single planes are for more aggressive engines. Victors are a race only type of manifold. Or really agressive street engine.

I just purchased headers and a dual exhaust kit from them. Headers are Hooker Comps @ $160 and the exhaust kit from headers to rear bumper was a $180. It includes mufflers. A great deal IMO. The addition of an H pipe would be good to use though. Only $30 more. $340 as is now, with H pipe for $370. Best bolt on deal you do.