Anybody know where I might locate a full length stock "International" style for a Ruger 77 tang safety in a long action as in 06/270 etc

Only from Ruger, but you would have to cut the barrel and remount the front sight and do some judicious inletting....or have a custom stock made, of a simi-inlet cut for your gun which shouldn't be too expensive if the stylist has a pattern, if not add another $100.00.

On second thought to the above, the best solution would be to trade your gun in on a Ruger Int. in 30-06 or .270 and pay the difference whatever it might be, it would be cheaper...OR sell yours and buy another...you might find a used early 77 INT. with a tang safty....