Sherpa, I think you are going to find that the psb is going to be near impossible to get a hold of. If your problem is that you have an LS body without innards then you might consider putting a sammie into it. (sammie such as what "The Shoppe" has) CY has in the past said he intended on selling a package that would included the special heatsink and some other stuff needed to install a sammie into an LS body. So far he has not posted that this package was available. I couldn't wait so I had a local machine shop make me a heatsink and I went from there. Mad Max+ and IMS reflector later and wow. Works very well.
Good Luck,
zwf