I kinda like the melling spc-3 in your car. Someone else is a better 670 expert than I am, but I seem to recall noticing most of those 670s in stock form go pretty much turbulent after .4” lift.
If you want a little more cam than the spc-3 later on and the valve terrain is handling the factory 1.5 rockers ok, then the melling 1.65 rockers would very likely bolt right in and clear the pushrod holes. That spc-3 is kind of unique for that for it’s size.
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