I got this buick 350 but don't know what year it is. here are the numbers if anyone can help: Back of block 1241748 with a large 6 above it. also the intake has B-1249169 with 28 below it.
Buickgod.com says this: http://216.239.51.104/search?q=cach...+buick+casting+numbers+1241748&hl=en&ie=UTF-8