Michael,

You really do need to talk to Steve Epperly about this stuff especially the A-motor permutations. He knows how to get 46mm SU's on an A-motor and I'm not that current on that lash up so will probably not be of much help in helping you get it right. Steve did say that most of this stuff is near unobtanium here in the states as it was mainly JDM offerings only.

He has some examples of manifolds and or complete sets, etc. but is not really excited to sell any 'cause he plays with A-motors in a couple of autocross cars here locally. Anyway, he said he would be happy to talk with you.

Thanks Bruce, I've sent you a PM.

Oh and just to put a little bit of Z content back into this thread, I found some nice ram pipes that will work on the Z carbs. aptfast.com is a site for British cars but since the HS6 SU's are equivalent to the Hitachi SU's many of the parts there will interchange. Here's a pic of the HS6 Ram pipes at $32 each or so. They also have several filters available.