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just my personal preference - im using crower springs/retainers and 403's in my ls turbo build (...or 404, I really cant decide)
Crowers are fairly inexpensive and, now with the new 20%+ cores, they are fairly durable.
I know the 403's will continue making power to at least 8.5k, the 404's are higher (but I wouldnt go above 9k unless you have a block girdle)
Did you ever measure the lift/duration of the cams you have in now? They cant be too wild, because you didnt mention any dual springs.
Tuning of anything will always net you the best gains over just winging it. Hondata has a lot of features that are fairly intricate and will net the most gain (over say an afc)
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