Custom Cam

Hmmm...1.6 ratio rockers for a slant...now that's a strange critter. Options seem to be few in this department...Pentastar Parts has this

http://www.pentastarparts.com.au/sunshop/index.php?l=product_detail&p=811

Or...yeah, that's about all I know of. There was a fair bit of variation in slant valve gear, though. Given a large enough collection of factory rocker arms, you could sort out a set of 1.6 ratio rockers for it.