I did one a well ago didn`t take any progress photos of how I did it with a 67 AMT GT350 Mustang. I remove some material behind the gas tank. Than I moved the sub frame up about 1/8th of inch to line it up with the wheelbase. If you check out my you tube channel under my real name you see that I did use the same chassis to my AMX johan kit Drag On Lady. Just look for my real name on you tube.