Long tube.
‘67 Cuda, manual brakes and steering below.
Mini starter slips in and out without touching a bolt on the header. The slip fit was an initial PIA, but now that I have done it, it was really a no brainer. It is tight and a PIA to install, just get it up, slide the tube into the tube, rubber mallet tap it in, twist the tube & flange to the head, presto.