TR6060 and TB suspension? Any info on the starter interference?

I don't. Valid concern.

Just went out and took some quick measurements of my current setup and the mockup.

Looks like it is about 2.5" to the end of the crank pulley on the 5.7 to the pinch weld on the k-frame. Note this is a truck crank pulley, not sure if a car is shorter or longer, but I'm pretty sure they are different.

My current 360 w/ PS is about 1.75" from the end of the crank pulley to the pinch weld.

So the accessory drive on the Hemi will be something like 3/4" tighter.

Yikes. I mean, my set up is probably not the thinnest possible, but I don't have 3/4" to give with the 3 core 26" radiator, Contour fans and the serpentine pulley on my 340. As it is mine works because the fan motors are offset and away from the water pump pulley.