Engine and Head Identification

[zsparkman]

I seem to have a rogue set of heads and contradictory block stamp. The car is a 56 Chevy, 210, I got from a cousin who had the engine lock up in 1971, and has been that way until now. The casting number on the block is 3703524 which decodes to a 1955, 265, however the assembly stamp at the front of the right side head is F55E. I know that decodes to Flint, 1955, but the suffix "E" decodes as a 1957 283. Personally I think the assembling technician grabbed the wrong stamp and that it should be coded as "F", which would be correct according to the casting number.
The other head scratcher are the heads installed, by looking at the front casting they are four barrel heads, and it does have a four barrel carb and intake. The intake casting is 3837109 and decodes as a 56-57, 265/283, 4 barrel, with a Carter AFB.
The heads casting numbers are 3773013 and I haven't found a date cast on the heads. I have yet to find any info regarding the heads, via the casting numbers. Any help on identifying the heads would be great. Thanks.

 

[zsparkman]

Short follow up, found the answer to the block ID, traces to a 55 commercial truck, 5000 series. Now the mystery of the heads is left to be solved.

 

[hurst01]

zsparkman,

I have looked through all of my sources. The closest thing I can come up with is 3773012, 265 cubic inch, 1955, 1.72/1.50 valves. Could you be one digit off?

 

[zsparkman]

Hurst01

I'm sure of the digits on the head casting number. I'm not sure if these photos will attach and come through ok, but I have pictures that verify that number and also the casting mark on the front of the head. I have been coming up against the same road block with the casting number, and found the same info that you did, one number off, but there is no doubt the last digit is a three. Hope this helps, as it is just as puzzling to me. It would be nice to solve this mystery.