You could go either way in my opinion. Since the E cam has better nock travel and is supposed to be more forgiving in the spine department you could go with the .340 spine 3/60 or you could go with the .300 spine 3/71. It's normally better to be a little overspined than a little underspined but the 3/60 should be fine. I believe you will be getting toward the upper end of the spine range with the 3/60 but will still fall well within the spine range. It depends on the size head that you are shooting and what you are looking for out of your setup. I am shooting the 3/71 out of my 04 SC Patriot at 30 inches with a 100 grain head but I wanted to get my arrow weight up without switching to a 125 gr. head which would have put me a little underspined with the 3/60 IMO. My arrows are cut to 29.5 inches and they weigh out about 444 gr. Since the E cams also seem to be more efficient with the heavier arrows I would probably go with the 3/71 and it will leave you with a good mix of speed and KE. This is JMO maybe some of the more knowledgeable folks will jump in here.