I've recently checked out a 70 XR7 that I'm interested in buying. The car is in good shape with only 65000 actual miles. The only problem I can tell is that it blows black smoke out of the exhaust when the car is started. The guy who owns it even has two black soot stains on his garage floor where the exhaust pipes blow. Any ideas on what is going on?? The engine is a 351W 2BBL. Some friends of mine think it needs a valve job. If this is the case does anyone have a ballpark figure on what a valve job would cost and if I need to go to a repair shop specializing in engines?? If anyone knows of a good engine shop in the Cleveland OH area I'd appreciate the referral. Thanks in advance - I've been cougarless for over a year and I really want to move on this.