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I've replaced dozens in the 80's and 90's. Asti Magnetics sold a rock-solid product back then. Have also installed some OEMs.
Good that you have a scope to look at the FM waveform when adjusting P2 and P3 guides but may not be "absolutely necessary".
The really important thing is to use a "reference standard" tape- one that you know was recorded correctly and is known to play back correctly on (hopefully) at least a couple of VCRs. You don't want to be digging around for tapes AFTER you replace the head.
Good luck on your project!
Brian
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