10.5:1 Pistons for '66 273 Block w/ '67 920 Heads

gorgerider said

For example, I keep looking for an intake that'll take S.U. carbs for a /6 application!

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Can't really help you with the other stuff. Your best best in finding a slant manifold to suit a slant is most likely eBay.com.au (Aussie eBay). Here's one listed for sale:

http://www.ebay.com.au/itm/CHRYSLER...769917?hash=item4189dbfcbd:g:itkAAOSw~1FUVs5P

I sold a really nice complete triple SU manifold and rebuilt HIF6s not long ago to a guy over at .org They are out there!