your engine could be 1 of 3 engines lightspeed, a 302 from a 68 or 69 Z28, extremely rare and a very valuble find, or a industrial truck 327 from the same years, or the most common that carry`s this number, a 350. best way to tell is to get the suffix code stamped on the front deck pad on the passengers side. check out www.mortec.com
if ya ever need casting numbers. suffix codes are also easily avalible as well on various websites. keep in mind though,, a 302 crankshaft flange would be round, while the 327 and 350`s are shaped like a mushroom.