Dougs installation problems on '74 Duster

My friend just installed a set on a '70 dart,he was not happy at all with the fit.... 2 of the tubes just about touch his oil pan along with other issues..he wishes he bought tti's after seeing how easy mine went on and how nicely they fit,and clear everything..plus he paid $442.00 for the Dougs and with the issues he had with them said he wished he bought the tti's for $631.00..