Not sure what you mean here. Offy's are basically a short runner manifold - similar in size to to a stock 1 barrel or stock 2 barrel. Long runner manifolds include the Aussie manifold and original and reproduction Hyperpaks.
X2
this is the only 4 barrel manifold offy makes for the slant 6 that I am aware of
http://www.ebay.com/itm/Offenhauser...ash=item2ee98d3255:g:yaUAAOSwyQtVnvWH&vxp=mtr
The long runner ones are Aussiespeed and the Hyper-pak