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Plenty of better cam's & cam/head combo's than the LT4, that 'was' the ticket a few years back but there have been many improvements in the past few years.

Do the basics, as BEN13 mentioned, except for the cats, waste of money unless your's are damaged. Some 3.73 gears, a PCM tune. If automatic a good stall converter.
 

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If you are sure they are no good, then some after market Hi-flow cats should be fine, depending on your states inspection laws...and inspectors. Most newer cats , even our Impala's 12 yr old ones flow very well and are not the restriction alot of people think they are. I don't know if the f-body & B-body cats flow the same, but most likely they do.

The biggest restriction on the Impala is the 2 1/4 pipes and the mufflers. Headers, cats, 2 1/2 cat-back and some good muffs should be more than enough for most LT1's even most 383's. Keep in mind Flowmasters are very popular, but DO NOT flow the best. There are alot of muff's out there that flow better, and from a performance stand point, that is what you should look for.
 
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