This Has 3921968 as a 64-76 Chevy/Olds 230-250. I'm pretty sure digit #2 is a 9 (not an 8 as Dan suggested), can't see a 1 in the #4 position (but I'll take Dan's word for it), and pretty confident that the last 3 digits are 968.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.