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Swapping from BB to SB, what's involved?

Not sure of the angle you would end up with, and the only problems I could foresee is driveline vibration if any and maybe your fan hitting the shroud.
 
And so the plot thickens....

I finally got the car home and have been doing some work on it. I took a little paint stripper on a rag to the Toploader tag and what did I find (to my shock really), but a HEH-BW tag. I checked it out online and that brings up a 1966 Mustang 289 toploader (wide ratio). Upon closer inspection as well I see that the clutch fork is not a '70 style big block but resembles more the '67 390 style (there is no hole in the fork for the lower clutch rod to pass through like the '70 style is). I also am missing the 390 STD stamp on the bottom of my trans crossmember (although it was painted with an imron paint so is rather thick and may be covering it up).
 
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