Some where along the way my car lost its original engine. I got one out of another car of the same year and model. But the date on the block is off.
What is the point deduction for a original engine but the casting date is later than the build date of the car?

As of right now there is no deduction for the correct displacement engine that looks like the original. So in your case no deduction. It may change sometime in the future but not likely any time soon.

The VCCA doesn't go by build dates.

The VCCA doesn't go by the cowl tag information either!

What about a documented replacement with a not original engine?
I have a 1931 sedan. The engine was replaced in 1937 with a 1934 block & internals. The head (?), manifolds, and carburetor are from the original '31, as are the starter, generator and ancillary stuff. The fuel pump and (vacuum advance) ignition are '34.
I have a copy of the original 1937 biil-of-sale for this (warranty? repair)- at a whopping $135! It specifically lists the old and new engine numbers, presumably for registration (Texas, which used the engine number as the vehicle ID).
My car's probably never going to be VCCA judge-worthy, but that's been my standard as i restore (20+ years in progress, so far). I'm not going to replace this engine (it works great), but I'm curious.

Points will be deducted for your engine since it is the wrong year and the wrong cubic inches.

Rob,

How did they make the 34 vacumm advance work with a 31 updraft carb? Just wondering since you really need a 33 or later downdraft carb that has a take off for it to work.

1931 head will not fit on a 1934 engine.
It will fit on a 1933 engine. The fuel pump attaching bolts are straight accross on a 1934 and one higher than the other on a 1933 block.

31rob55,
A '31 head may bolt up to a '34 block but will not provide proper cooling as several of the coolant passages are either blocked or different sizes. Are you sure it is a '34 block or a '31 block cast in 1934?