In my opinion, setting up a Burtz block as completely stock is a waste of the block. The bottom end is so strong compared to an original block that any modifications will not effect the reliability. At least put a high compression head on it.
I have an engine that has very good parts on it and I plan to swap out a lot of the parts, such as the manifolds, head, oil pump, carburetor, flywheel, etc. Not the pistons and rings and gaskets, of course. And I will use new items like the clutch disk, throwout bearing, pilot bearing, etc.