Hey Shane,
I think I've figured out who made your Westwood SG.
The headstock on your SG is very unique and matches the headstock used on Conrad SG copies. Conrad was a brandname used on import Japanese guitars by David Wexler & Co. of Chicago. Michael Wright suggests that Kasuga was making the guitars Wexler was branding Conrad. Given the similarities between your SG and the Conrad SG below, I would say your guitar was built by Kasuga as well and imported by someone other than Wexler.
The value of your SG is probably $300-$400.
The date on this ad is 1972.