Bill that is a pretty wild looking manifold! I can see that it was intended to benifit from DIE? I've been leaning more towards a close fitting 'over the top' manifold
which would be usable for either pusher or tractor installs, however it would be somewhat simpler than the pictured unit. It would take alot of 'study' and prep work to
get a cast unit in that configuration. More than likely it would need to be hand fab'd and welded [same as what is pictured]. This is 'doable' but the added cost of getting
all those parts together and into a working unit, would push the cost up past the 'reasonable' level. At least as far as i can tell from a your picture. Of course I could be seeing
more complexity there than actually exists. However, that being said I'm open to all options and suggestions on how it could be made to work! :)
Best regards
Jarrett Johnson
www.innovention-tech.com