powerglide to mopar small block adapter questions

Thanks for the replys, I am pushing close to 800hp at the crank and the cost of building and maybe repairing a 727 in Australia is just crazy. The powerglide transmissions are very common here so the cost is much less. The powerglide trans I have is a upgraded 6 cylinder one so it ha the removable bellhousing. I'm trying to find the easiest and most cost effective way to do it.

I can buy a bolt on JW bellhousing here for $750 aussie dollars. Then I would need a custom converter.
But I heard there was a kit I could buy that allows me to use the JW bellhousing and it comes with a flywheel and crank mounting boss to allow me to use a standard GM converter but I cant seem to find the kit.

Does anyone know If I was to go with the Middle plate set up what convertor I would run and how do I fit the big square plate in the engine bay? Do I fit it to the trans/engine and trim off all the excess?
Sorry the coan link just went to their home page.