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Message: <blockquote data-quote="94kingcbra" data-source="post: 509006" data-attributes="member: 9140">make sure the spring tension on your valve springs match the lift and duration on your custom cam...If they aren't strong enough, you will have valve float...If they are too tight, then that is extra resistance that the engine has to over come to turn...Your cam grinder should be able to tell you the correct tension and length to work with your afr's...I highly recommend that you blueprint your block, and balance your your entire rotating assembly, it will make a huge difference in how smooth it runs...30lbers should be fine with your combo, they work great with mine...and the longtubes would be great, as long as the ports on the heads are close....Use a copper head gasket with permatex copper silicon to seal them forever....lt me know if you have any questions, I pretty much have the same combo and mine passed smog in Cali on the first try...So I think I did alright...lol  Good Luck!</blockquote>