First engine build question

I would NOT deck the block or mill the heads . this causes sooo many fitment issues with intakes , pushrods and rockers . I suggest messing around with different head gasket thicknesses . this is a much easier way to achieve your goals than milling a bunch of cast iron . I also suggest very strongly to have the entire rotating assembly precision balanced . The expense of balancing pays of in smooth operation and engine life downthe road .