I totally agree with Capri306. You will not notice much with the stock heads and intake. The extra lift can give some more top end, but it would be hard to notice by seat of the pants. Wouldn't change the exhaust sound, though.
The $200 you spend on the Cobra rockers could be better spent on 1.6 or 1.7 adjustable rockers which you will probably need if you put performance heads on in the future. Very few really good heads use stock type bolt down rockers.
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