The rebuild is not that bad, I followed the Berk manual on their web site and it worled great. Just ask if you have any questions, the one thing you will need is the deep socket for the impellor nut. I made one out of a socket that I cut in half and welded a piece of tube between the two for the depth I needed.
I have never worked with Tom at JBP but he sounds very helpfull if you need him. I did though purchase my rebuild kit from CP Performance, the kit came with everything plus an impellor. CP Perf. is pretty much Berkeley I would imagine you're getting good parts and not the cheap stuff, make sure not to get the cheap stuff! This whole job cost about $500 with making the tools and all, it's worth a shot to try. Again, follow the specs in the Berk manual and ask if you are not sure.