Concur with Joe. I like the nostalgia and sounds of the 1970 mod. But the cars are very hard to drive at this circuit. The tires have very little grip, requiring very delicate and conservative driving. Orchard Lake isn't a super-speedway like Daytona, so you have to lift on the banking in Turn 4 with these cars. And as stated, they do not like the infield corners at all. My best is a 1:23.5 on the stock setup, but I never made it through a stint without wrecking. When the night closes in, the weak tire perfornamce could make for a race in which no one finishes.
While I like this mod a lot, I think the tire model is a bit too conservative - just a bit. It makes the driving so technical that most would find it boring - until they crashed out.
The ILMS mod, however, has its own quirks. The biggest is a tendency to snap into a spin under braking and downshift. It might have something to do with the aero model or the rear axel modeling, I don't know. But this tendancy can be mitigated with mroe rear wing. I like this mod as well, despite its flaws.
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Chunx