Those heads have pressed in studs??
Adjustable valvetrain is likely the cheapest mod you will make unless it has pressed in studs. The heads can get expensive real fast(seats/guides/valves/tap studs,etc).
Important variable in cam selection is rear/first gear ratio.
I always feel it is best to send your stuff to a machine shop and have them quote you what NEEDS done, see how that fits your budget, then decide how much is left for hot rodin..
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