Replacement Cam
FYI, I'm running the Summit K6900 in a 74 318 with 600 Eddy, duals off the stock manifolds, stock converter, and 2.76s (for now, just like you). It's specs are identical to the Melling MTD-1 except for .001" difference in exhaust lift. It is definitely not over-cammed. I really don't think it idles much different than stock and still pulls 18 inches of vacuum. As junkyardhero said, there are more modern grinds that would give more "under the curve" results but it was dirt cheap and is easy on the valve train. Also, if your engine is actually a 69, it will have higher compression pistons from the factory. Hope this info helps.