TPI Runner Question

[WEG1192 at aol.com]

I recently bought (bid rather) on a set of 1992 speed density TPI stock 
runners. Only after I won the bid did I notice that the small tube on the 
driver's side runners was not there. My understanding is that this tube 
carries idle air from the upper plenum passage to the lower manifold. Without 
this tube, how does idle air get to the lower manifold? Is the upper plenum 
on speed density systems designed differently internally? Is the throttle 
body different? As a fix, has anyone drilled holes in the upper plenum from 
the idle air passage into the upper plenum intake tract?
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