what year mustang? what size motor was "swapped in"? if all he can tell you is "v8" then he's probably lying. the majority of anyone i've ever talked to that was into cars and had a mustang knew the displacement at least.
another friend of mine had an 85 lx mustang that was originally a 4cyl. he dropped a 302 in it and it was no longer a 4cyl. i think his insurance was only like $12/mo. due to the ins. company thinking it was a 4bang stang.
to me it just seems shady that he's not willing to pop the hood, unless he really does have something to hide.
