Alright here goes....
Radar is right be extra leary of anyone like this, specially someone who you weren't tight with coming up.
But if I was you I wouldn't tell him anything except the fact that you know someone who could probobly hook him up. Then figure out what you want first, next ask him what he wants. Double charge him so he pays for your stuff as well, I used to do that when I was growing up, But remember just wieght out the facts, Is it really worth it. I have found that helping friends out doesn't pay off cause they DON"T know the game and then you get asked every single day "hey what's up with the order" and it wears my patients very thin, then if it gets siezed or something they want their money back...I guess what I am tring to say is don't tell him shit just keep it to your self, don't do anyone any favors....What has he ever done for you?? Let him find out on his own.