Is there any reason I can't put the head from a M10 on a M14? The M10 head is a second generation head with the spark plug between the valves instead of over the exhaust valve. I read on the Brian Miller site that the second generation heads made less power. Any thoughts? I am only considering this because the head cover tin is for the M14 was hacked by a previous owner and I don't have another cover. Thanks. Bill