Lockup converter for 360

I have a never 318 coupled to 727 with lockup in my 68 Fury. I am planning on an engine swap to a 360 and I know that I must change the converter. What is the easiest way to keep the lockup transmission, changing converter, get a weight kit and weld it on my converter or buy a flexplate that is made for this swap. I think B&M makes those. I live in Sweden so freight is also a factor.
Author: Swefury