950 rpm is way too high for a stock cammed 70 340

Turn the initial to 16*, limit mechanical and it may even get rid of your bog. See if it starts hot at 16* and I bet you it's a bunch snappier at idle. Don't drive it with 16* initial until you limit the mechanical advance

Learn what it takes to limit mechanical advance. Otherwise you will be hamstrung with a crappy running car at idle and low rpm due to the emission requirements these cars were built with.