We've got full length Flowtech headers from Summit, part BIG-12102FLT . They say they'll fit '64-'70 with a 5.0, but not with a c-6 trans. We're using an AOD tranny, which doesnt seem like there would be any problems with that. The area we're running into clearance issues is the inside of the strut tower. We havent put in a HUGE effort to put them in, the just really dont look like they'll work. On my last '66 Mustang we put some full length Hedman headers on the 289, so we're just at a loss at what we need or need to do. Thanks everyone for the welcome and responses!