I think the basis should be as in period.... would it be that difficult to get hold of the regs from the Motor Six Hour International Saloon Car Race? They mention Group 2 - is that FIA Appendix K? The Autosport report in the excellant link talks about reliability being the great leveler. There is a lot in that - hot rods do not last as long...
I was going to print the Autosport report quoted on Frank's site but not sure of the copyright rules but anyone who has not done so should read it - great reading..
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