GM 3800 (4781 casting #) Head CAD

[gr_mich_mush]

Does anyone know where I may be ably to find CAD information for a GM 3800 (4781 casting #) head? We have a customer that would like to have some modified and it would be A LOT easier if I had CAD to start with. I've googled every variation of GM 3800, GM 3.8,GM 4781, and can't find anything. Any help would be greatly appreciated.

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