I might be purchasing this 67 coupe with a 400hp 351 Cleveland. It's an automatic right now (A C4, or what I like to call the Slush-O-Matic). Are there any articles about how to put the whole clutch assembly in? Also, what would be the best transmission... Borg Warner T-10? Or, would it be difficult to put a Cobra Tremec 5-speed in there? Thanks!