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.

I assume you have a cage with 800 hp? Build your mid plate support down from the dash bar and tie it in below to the frame rail. You don't leave it square, you trim it down.

The coan website has changed quite a bit, I didn't see the exact kit I was trying to find - just call em they're very helpful.