Not Ranked
It's always wise. I wouldn't assemble an engine without doing it. If a lot of minor issues stack up against you, such as the piston deck height being out of spec, the cam not being ground the correct way (did you degree it?), using 1.7 rockers on a cam that's designed for 1.6's, etc....then that piston/valve clearance could go away in a hurry.
With your lifters, you will either need to use checking springs, or if you don't wanna take your heads apart, I'd use a solid lifter.
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