I assume that you have tried Googling "chevrolet parts cad drawings" and looking at the images?
Clicking on an image should bring up an enlarged view, with the option to visit the website it came from and see what else they have.
This Chevy Small Block 3D Model for instance: https://www.3dcadbrowser.com/download.aspx?3dmodel=1599
Once you have a model you can take any 2D views you like from it.
You are probably going to have to pay for stuff like this though.
These guys have OEM CAD files and say they have a library of Chevy stuff, they also scan parts themselves.
https://www.semagarage.com/techtransfer/index
Or have you tried contacting Chevrolet themselves?
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