maybe this question actually is beyond the scope of this forum but I have a 350 sbc in my '58 Apache. I would like to know what this motor originally came out of. The serial no. is V1207CKR. It is a 3970010 casting. It is painted blue instead of the more common chevy orange. The head castings are 333882. Originally wore a Q-Jet carb. Has the same alternator bracket used on the '72 Camaro.(original??? I dont know ). I dont know how much emission "crap" was on it originally as it was already in the truck when I bought it and has no emissions on it now. Anyone have a way to track this one???? I already called my local chevy dealer and was told only that they think it came from a truck........what years did they paint the sbc's blue??

'58 3600 350/4-sp/stepside/big window cab
'59 3100 235/4-sp/stepside