Those rusty elbows don’t look half bad. Even if the threads are messed up it’s pretty trivial to weld the threaded end of a nipple on, like finsruskw said. Plus, if you buy a threaded-both-ends nipple, you can use the unused half to clean out the threads in the block. Just cut some slits across the threads with a grinder or dremel to create a makeshift “tap.”
__________________
102
|