Want to preface by saying I appreciate the effort that goes into converting mods to AC and it's nice to have these cars represented.
However there are some big issues here, some of which are not your fault but many are fixable.
- 6 Different engines, but only the Porsches have different statistics. All statistics are wrong based on the values I could find in a quick google. This may just be how it is presented in CM.
- This may not be your fault, however all the engines are chevrolet V8 models, with twin turbos. These cars were not twin turbo, and not all V8s.
- Likewise some of the cockpits are very strange with extremely low steering wheels, but that may not be your fault or fixable.
- None of the engines have any textures, apart from one texture reading "Chevrolet" on all cars.
- All the engines have the same sound despite some being different types in real life.
- Light shines through the cockpit. This can be fixed by setting the shadow casting of the objects properly in kseditor.
- Windscreens are not transparent. This can be fixed by setting the screen object to allow transparency in kseditor.
- Almost all driver models have been positioned poorly, with feet going through the floor into the ground. They are all too tall, especially on the Porsche, where if you look in real life the driver chin is not visible from the side, whereas here you can see his shoulders. You can fix a lot of this with CM Showroom's driver moving feature.
- Driver model placement is inconsistent even between cars where the model is not changing.
- no LODs.