I am in the planning stages for my 400 HO build. I don't need or want a fire-breather, but a good running, powerful, fairly stock engine. I have a Q-Jet available, and the stock intake, but I also have an Edlebrock intake and carb - I think the Performer series - also available. I was thinking of a mild cam upgrade also, as my wife likes a rough idle . What upgrades are recommended besides the hardened valve seat inserts? Do the valves need to be replaced also? What rods and rings? Thanks!