Help

[Anthony]

Ok I am having trouble figuring out my engine size. I recently bought a 1985 Camaro Z28. Motor has been replaced with a Chevy small block. Here is the code stamped on block. It is giving a suffix code of ( UPJ) and from what I can find on Internet that is code for a 454 big block. Anyway, here is what I have as far as code.
V0624UPJ. Flint, June 6th I get but its not a 454????