I have a 1975 dodge dart sport. It has a 1978 400 from a rv in it bone stock. the 400 had 37k miles on it when pulled, i have also got a new cam kit for it and much more. I want to get its compression around 9.5-1. Factory is anywhere from 7.7-1 to 8.2-1 from what i have found. Doing a compression check on it before taking it apart it was 125-124 on all cylinders. I have purchased the mopar head gasket set that is .20 instead of the stock .40. I need to know how much to get mil'ed off the heads to get it in the 9.5 area safely with those gaskets. I do understand that doing the deck would be a lot better but i plan on changing the engine down the road anyways. Also something that might help the heads are 4006 452 casting, the car weighs roughly 3200lbs it has a 8.3/4 rear end. Any exact numbers that i can tell my machine shop would be extremely helpful. I'm by no means a top notch mechanic but this is a project me and my buddy's work on for fun and don't wanna mess it up. If any more info is needed i can supply.
