The most "significant" Chevrolet performance car.

[LS6 RAT]

Interesting that you consider the L-88 a package. It was not bundled as such. When ordering the L-88 option, there were of course some mandated options but they were priced individually.
The ZR2 package, available to the '71 LS-6 engine was a package. The list price was $1749.00 and included the MA6, K66, V01, J56, F41 etc, along with restriction of options that couldn't be ordered, just like on the L-88. However the above options were NOT available separately on other models, which is not the case with the L-88 years. Those options were available separately and could have been ordered with other engine options.
So as to a "racing package" you would need to give the nod to the LS-6 ZR2 Corvette of 1971.