I reckon it would have made a first rate interceptor. Rotary launcher in the bpmbbay with Phoenix or whatever.
Where the Vulcan lacked speed against the F3 it more than made up for it in its ability to fly high. The F3 aimed to use missiles to take out the height gap but no one explained how to do a VID at 50k. True many aircraft could outrun the Vulcan but not for long in the UKADR.