Hemi Swapping a perfectly good 70 Duster

I'm using the cast lakewood housing. You can see there was a small interference with the TTI header, but that was easily fixed with a grinder. Note the clearance on the starter from an early 2500 with a manual trans. This thing is smaller than the mini starter on my 408! It will fall on the floor without taking the header off too.
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I use mechanical linkage on my clutch. TTI says the Z-bar needs to be modified. Here's why. I'm making a new arm for it with a dog leg so it clears the tube.

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Did you consider hydraulic clutch setup?