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Springs and retainers are cheap. Honestly, unless a cam is in your plans, changing springs and retainers isn't really necessary.
A good set of ported 3500 heads is better than a good set of ported 3400 heads. Flow is one part of a quality set of heads; it's not the only consideration.
I've had 2 sets of ported 3400 heads - one good, one great. In the works is a set of killer ported 3500 heads.
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