The casting date of the block and the build date of the engine and the build date of the "car at San Jose" and the completion date at Shelby American are all different dates - 4 dates.
With regards to the first two - casting date and engine build date on a K-code 289 HiPo these occurred in Cleveland Ohio.
The completed engine was then shipped to San Jose (near San Francisco) for installation into the car that although able to be driven off the assembly line still had to be shipped to Shelby American (Los Angeles) to be completed into a saleable car - '67 GT350. Not likely that the first 3 occurred in 19 days. (When you refer to the car build date are you referencing the San Jose build date or the Shelby completion date?)
As suggested by Jeff S... a much longer spread in dates is typical.
...With that others in that production period (give or take a week or so) at San Jose have been found with casting dates for the block from Jan 67 from what I've collected
To your initial question...
I have really never entered into a discussion regarding the values of 67 Shelby GT350 having the original engine or an engine with the correct casting numbers.
It seems like most Shelby's had there engine replaced along the way. Any thoughts.
In Judging is any of the casting numbers and build date of engines even considered?
Does anyone have a comment on this subject?
Value of a car that has it's original engine (block?) vs not having the original, but having one with the correct casting date?Some buyers value (desire) original drivetrain and others the original sheet metal - doesn't seem to be a clear-cut issue. Typically the more original to the car is the most valuable as you are probably well aware. Trying to but a dollar amount to that is very difficult because then other issues/variables kick-in such as color, trans and more.
With regards to the last question in you opening post...
"...In Judging is any of the casting numbers and build date of engines even considered? ..."As you can see above - YES and depending on the organization and the judging class in that club the expected varies.