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Nothing small, that is worthwhile, anyhow. The 113 heads are much better, but there are EGR considerations. Complete engines, if you go late enough. Chevy's TPI is only marginally better than the Crossfire, so THAT is a waste of time and money. There are few aftermarket Crossfire parts available, most of questionable effectiveness. Unless you are prepared to spend the BIG bucks, the Crossfire is more of a "DYI" project engine.
What parts are you interested in?
* headers are the same for the L-83 and L-98
* heads will work from a L98 although you'll have to use center bolt valve covers for the Al heads
* there are two different blocks used in the L-98, roller and non-roller
* the air pump delete pulley you see advertised won't work on a 84 but you just need a shorter belt if thats you goal.
* if you want to tune then a popular choice is upgrading to a 7747 and a prominator
* As far as aftermarket manifolds if you stick with the crossfire set up, there is a x-ram or you can use a SY-1 or offy with some modifications. (if your not doing to major of mod's just port the stocker, the intake ports are about half the size they should be)
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.