for your P/S pump check this out. in fact for any aftermarket/cross-breed/mix'n'match bracket setups Alan Grove is the King. I've had his P/S bracket for short water pump small block on my truck since 1993 when I did the sub-frame. nice deal, well braced, short belt. He understands how to make stuff so it works.
http://www.alangrovecomponents.com/S...Short_Pump.htm
scroll down to # 400L. sorry, no individual page/link the way his site is set up.