i have a question about a 68 307

i recently came across this motor the casting # on the back drivers side says it a 327.the casting # for the heads said they were either on the 307/327.the intake wasnt stock its off of a corvette.and the #'s on the front passengers side said that its a 307 out of a chevelle.

so my question is what motor do i have?

Check the casting numbers on the left rear ledge of the block:

http://mysite.verizon.net/strey/files/SBCCastNumbers.jpg

whats a good website to check the casting number?

the casting number is 3914638

Use Mortec.com for number info.