Hi Shazz, just had my first experience with a Bigsby (B5 in my case, but they are the same principle) and mine looked pretty much like yours before I strung it up. I only use 9-42 strings and even with those I had to shim the spring with a 5c piece because it was too low. So I doubt you will have a problem.
Cold bending is the usual way if required and you could also look at a replacement spring, either shorter or longer as required, presuming that they are the same size as a real Bigsby.
Lots of luck with fixing the strings to the Bigsby. Mine was a nightmare. Make sure you google before you do it. I wish I had. I found that using a capo to hold the string in tension was the best method.
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