Burtzs block

[ModelA29]

Originally Posted by P.S.

..... some people on the Judging Standards Committee are now discussing the differences between an original Ford engine block and a Burtz block so that it can be identified as a "reproduction part". If it is identified as such, it will likely receive a deduction or possibly zero points, the same way a B block in a Model A would, at the discretion of the Chief Judge.

That is the way it should be. I see the Burtz block as a "peace of mind" addition for someone wanting to drive their cars great distances from home at freeway speeds - and of no use for the enjoyment of a Model A as it was designed.
I'd argue that the Burtz block is not a reproduction part because it is not a replica of the original part. It is as much a "reproduction" part as the Donovan engine was. https://www.modelaparts.net/hiperf.html/donovansem.html