The trans is a lot easier than you would think. tear into it. After that, get a book on the Th400. You will be amazed at what you can do.Would you mind grabbing some photos of the port/bowl work compared to stock? Once I get my 500 swap ironed out and build up some more funds, I'm looking to do a cam and head work later on. I'd also be interested in the particular combination of valve springs, retainers, rockers, and machine work to the valve spring seats/guides/etc. Also could you elaborate on what you needed to do to the trans to handle 1k hp? I've done a lot of wrenching over the years, but never played around inside a transmission before, always just swapped the whole thing when one would go out.