Intake casting numbers

Yeah, I've seen lists of casting numbers and looked up ones specifically for the intake, but the format is the big issue that I'm having. All the lists I find have a 7 digit casting number on the tables for intakes, but the casting numbers on my intake are a different format in that it's a 4 digit number then a space, then two digits a dash and one more digit. For instance, this site http://www.mymopar.com/intakecastnumb.htm was where I found the material I mentioned before, but my casting number isn't on there. If I ignore format and just put all my numbers together I get 2531152, but that number isn't anywhere to be found. There are some that are close like 2531915 and 2531914, but not mine specifically. Year One mentions the "Galen Govier Casting Number book", but I don't have it. If someone did and could look it up that would be nice.