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I first went with a Snyder 5.5 head and loved the increase in performance so much that I sold it and went with the Snyder 6.1 head and that was even better than the 5.5 head.
David R, You will notice that hills are much easier to climb. There is less shifting involved because you are not always looking for that sweet spot where the engine runs best. Your take off speed will be faster.
You should always take the head to a machine shop and check it for being straight. Both heads had to be straightened a little.
My spark is best at 9-9:30.