where to buy new engine

I'm going to have to replace my tired 1e 6 engine probably within the next six months or so, I have over two hundred miles on the original. I would like to have it balanced and blue printed, also I would like to have it beefed-up. Does anyone know of an online shop that will work with me and have it sent out by freight. I have found kits but I'm not sure I'm capable to do it myself. I would only be willing to pull my old one out and put the new one in.
thanks for any info,
Dave