Dont give up this keep checking, these things usually take a few days to get going and its raceday tomorrow so hang in there.
I've never personally done what your asking so I cant give you any of the info you are looking for. I'm currently building a 496 for my 69 camaro tube chassis dragcar its my first venture with a stroker motor and its been expensive and slow going due to my budget restrictions and this deep south heat wave. Sounds like you have deep pockets so I'd go for the 1000hp 632 but I think that shaffirof has had missed reviews here if I'm not mistaken, so be cautious. I'm sure you'll be enlightened either way. We tend to be a opinionated bunch, but we mean well. Welcome to the forum and Goodluck, Charles