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Here are some Japanese GT cars you might have seen racing in the 1970s:
Datsun/Nissan C110 Skylines, 240, 260 & 280Zs, 1200 and 1600 Race cars
Toyota Corollas and Celica TA-22s and also Toyota 2000GT (1960s)
Mazda RX-3s and Series 1 RX-7s
I have some experience in modeling cars using 3DS max and I sometimes make scale plastic car model kits as a hobby, the kits which contain top, side, front and back pictures of the cars are usually suitable for using as blueprints for 3d modeling. Maybe I could have a go at making a car. If it turns out any good I'd be over the moon if you wanted to include it in the mod, assuming you have any plans to include Japanese cars. I have no experience in modding for rFactor per se so I don't know anything about creating and modifying the physics, sound or just getting it into the game in general, all I could do is model the car and try to make the UV maps.
Here is a picture of a kit with a Mazda Savanna RX3 GT.
I also have a GT edition Savanna RX7 kit from the late 70s.