My friends set was for a 440. Also, I was mentioning this post at coffee and as it turns out one of the guys I work with has a set in his 360. Says they work fine so far.
I wasn't aware that CAT did a small block gear drive. I know Milodon does, but it's over $300.
How much is the CAT? And where is it made, although I have my suspicions.... :-k
