I have them on my 351W ... they fit "ok" back when I had manual brakes, manual steering, and an automatic transmission.
In their current form, with power brakes, and Tremec 5spd, they have been modified to the point that I might as well have had a custom set made. Especially since the original slip fit tubes were flanged and bolted together.
By fitting "ok", I mean they were only crushed by the driver's side upper control arm "a little bit", and would take about an hour of cussing to line up and bolt up each side.
After the reworking to clear the SROD bellhousing clutch fork and the power brakes, they fit great.