You could also pick up some tips on-line... ive been building custom boxes for years and it gets easier all the time. Spend some time and do it right.
Also check out http://www.caraudiohelp.com/ they have some great articles.
http://www.corvetteactioncenter.com/specs/c3/1971/71prod.html
Hers some numbers on ZR1s and ZR2s
and BTW there was a modern ZR2, just never reached production. 1989 model I believe.
Not sure what language but I have an article in an '89 Road & track somewhere...
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