Early 454 heads

[GMFORLIFE]

I'm guessing all the blocks are casting 361959 and heads are casting 336781.
Anyone find anything different on their truck?
Thanks.

 

[74 Shortbed]

Not all blocks have the same casting numbers, and there's a variety of heads, large oval port, peanut port, rectangular port, open and closed chambers with different CC chanmbers, and also aluminum heads, 781's are large oval 118 CC open chambered cast iron heads..