Help with partial numbers

Hello all,

I just pulled a 66 El Camino out of a barn and starting to go thru it. Need some help with a partial casting number.

Here is the info I can read. It is a BBC with a GM 4bbl holley intake manifold. Intake is 3868648 or 3869648 and has Holley cast in . I found 3869648 which comes back to a 396/427 holley intake

Casting numbers

Drivers side rear first 3 digits are unreadable due to gunk. x's are unknown

xxx15445 also has GM P and T14 towards the center

Pass side rear is C30 82

Pass side front ledge is ccs152176 I have found a CGS prefix but not CCS

The build sheet shows engine cyls 8 option 3

Sorry I dont have the head casting #'s as they are getting checked out at the machine shop.

Thanks in advance for any possible help

Cary

CGS is a 1970 454 345hp, manual trans LS4 (police) motor, according to this site.

http://www.nastyz28.com/spmenu.html