Stock-ish 383 Build

okay thank you for the suggestions.

Looking into this further it does appear that the 10 to 1 CR would not be achievable. I still dont know the chamber sizes but I called the machine shop asking for the head's casting numbers in hopes of getting a ball park on the sizes. They informed me the casting numbers were 3769902 & 3751213. So one of them is the 902 head but what is the other one? It doesn't follow the 916, 906, 346, 902, 975, and 452 convention.

So I guess the chambers are in the 88cc ball park. which get me in the low to mid 9's CR.