If you do not trust your mechanic, why are you using him? You will get lots of options on this site on how to build an engine but a good builder isn’t going to change the way they build engines just because you read it on the internet. Did you ever read the engine building books? They will help you understand what and why your builder is doing things the way they do. I’m not trying to be hash. I just know that building an engine “by committee” isn’t a road to success.