95% of the time the 3970010 means it's a 350, but there's been 2 or 3 blocks that have thrown me for a loop. (i used to work in a machine shop for 2 years) the only way to be SURE is to measure the bore diameter. 350's have exactly 4" (unless it's been bored already)
wow that's cool, it's a 4 bolt main and from the D129 then it's a 350 from April 12th 1979, damn i wish i knew what vehicle it actually came from...what can i do with the partial vin C8F4 46954 to figure out what this came in?