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So you plan on having, what a Type 4 mostly doesn't like, revs! I would recommend a set of rods not over 5.5 inches for a Type 4 and with a stroke of 80mm it wouldn't make sense to go over 5.4" rod length. Sorry, but you will not only move the powerband up, you will make it pretty small with it! Even torque will only be there, if you are in higher revs than normally!
Your plan is good, the Mahle Nika sets are rare, so keep them, but don't use it with a too high c/r, they don't like it! The sealing area in the heads are as thin as on all 103mm German cylinders, that wasn't enough under modern aspects for an aluminum cylinder. They started to break in this area.
I recommend the light lifters together with the light pushrods, lighter rockers and a nice pair of heads. What do you think about Type 4 heads with real Type 1 ports, where you can attach a Bugpack or GB header? Use them with original valve covers and a common fan shroud? Maybe without cutting away much of the rear sheet metal to get them in? Stay tuned, there will be a new head coming up! Not as expensive and you can use them with more common parts.
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