Mark the bolt where it needs to be cut, put a nut on the bolt so you cut the threads even. then cut it
Put the bolt back in the head and tighten it so it's at max depth, check height, it will still probably need to be grinded down about another thread or so to make it flush. Take the bolt out and grind it down a little more, Put the bolt back in and your done, It should of come out flush to the roof of the combustion chamber, Tighten the bolt
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Here's a Modification you should consider that will really wake up your engine performance and speeds
Shave the Head to make it High Compression
This info is for the Ambassador (Cruzzer) head only. Other Whizzer heads get shaved a different amount
Shave off that ledge, this shaves off a little over .100" making the head high compression
combustion chamber depth of the stock head is .465" shaved .100" it becomes .355" high compression
I shave .135" off my heads = .330" + .020" head gasket = .350"
No need to shave any more than .135" you can also shave only .040" - .060" for a mild improvement
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You can shave the head yourself if ya know how with basic tools -
Bench top belt sander , sand paper on plate glass & caliper measuring
Or it can be sent out
I'm not saying to run out and do this right away, something for you to consider if your not happy with stock performance
It's a great performance improvement over stock,