Greg Fletcher
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Kurt makes a good point that you do need to consider some extra time and money when switching cams. I installed a set of 107's on my otherwise stock engine in my project car and the their was some fiddly time in reshimming to larger sized shims. In my case, it was no problem and everything went very smoothly, but if you have some large shims in the head before you start you may need larger, custom, shims or a valve job by a good quality shop (such as West Coast Cylinder Head in Reseda, CA) that will take the time to be sure the valve stems are the correct length in relation to your desired shim range and camshafts.
On the performance cams- everything is in the profile and there are a lot of profiles out there. Sure you can get any place to grind a cam, but almost none of them will know what a Lotus is, let alone what the best profile for your 907 engine is.
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