I've a threaded shell, but i have got bb30 cranks, can you get threaded bb30 bottom brackets that the it can with fit the bb30 cranks?
There are some solutions in forms of bottom brackets designed to run 30 mm cranks in a threaded BSA bottom bracket shell. The deciding factor is the spindle length.
Searching the net for "bb30 crankset in bsa frame" gives e.g. this:
Threaded to 30mm Angular Contact BB - Black
Our solution for running a 30mm spindle crankset in a BSA threaded frame.
For use with 30mm diameter cranks with a spindle length of at least 104mm. Will not work with standard BB30 cranksets.
can you get threaded bb30 bottom brackets that the it can with fit the bb30 cranks?
That won't work, as the threaded bottom bracket shell simply isn't large enough.
BB30 cranksets have a 30mm spindle diameter. Per Wikipedia, the maximum internal width of an English or Italian-threaded bottom bracket is about 34 mm. Those few millimeters are not enough space for bearings.
I also think the BB30 crankset spindle will be too short.