A 408 stroker would be perfect. They fit with no modifications and can be pretty "tame" when you want that, but put out a lot of power when you want that.
As to my 340, I'd say it runs a little better than a stock 340, just due to the Edelbrock heads, and all the other typical hot rod stuff it has inside it. I don't think the .060 overbore is affecting it much, but it does have 10.2 extra extra cubic inches.
