If you’re not sure, put your head on a flow bench. Forget the flow numbers. Use your senses and see what they tell you. How does it sound? Flow the head in reverse. See what that tells you.
Then look at ANY head today that makes HORSEPOWER and see how many take the guide boss out.
The quick answer is NOT ONE.
Do what you want but make damn sure you do your due diligence before you pick up a grinder.