300 to mill a set of heads is steep, but I know alot of shops charge more if you have them milled alot. Realistically you can get a set of 906s down to 74 CC without going crazy milling. If a shop will do it for $100 bucks thats worth it, as it'd bump compression around 3/4 of a point.
The cheapest thing to do is find a set of stock pistons from an earlier engine and swing them in. I've sold a couple sets from engines I've torn down.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
