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I would not go down the JS rabbit hole, do a good stock rebuild and I would machine .030 off the top of the pistons to help lower the compression. stay with a camshaft with the specs close to the combat or stay with the combat cam. the combat head was usualy over ported and not a good starting point for a good port job so just do a good rebuild on it. all of this is if you plan to use it as a good all round rider. if you want to build a good hot rod I would start with an 850 motor as there are improvements to help it last a lot longer and is a stronger starting point.

[QUOTE="bill, post: 480468, member: 23"] I would not go down the JS rabbit hole, do a good stock rebuild and I would machine .030 off the top of the pistons to help lower the compression. stay with a camshaft with the specs close to the combat or stay with the combat cam. the combat head was usualy over ported and not a good starting point for a good port job so just do a good rebuild on it. all of this is if you plan to use it as a good all round rider. if you want to build a good hot rod I would start with an 850 motor as there are improvements to help it last a lot longer and is a stronger starting point. [/QUOTE]