Turbo Inlet Manifold/Throttle Question

["Mike Hopton" <mike@genesis-microchip.on.ca>]

     I'm fitting a 1986 MC engine into my ur-q and have a question I was 
     hoping you could help with the following? I would like to use the MC 
     inlet manifold with the MC engine, the two are different in the 
     following respects:
     
     - Ur-q casting quality is poorer, rougher casting
     - Ur-q manifold intake profile for each cylinder is closer to 
     circular, where as the MC intake profile has decidedly straighter 
     vertical side walls (any thoughts why?) There would be a significant 
     step/discontinuity if I bolted the ur-q manifold to an MC head and 
     this is the main reason I want to use the MC manifold.
     - Ur-q manifold lighter
     - Ur-q manifold is weaker it lacks some of the reinforcement on the MC
     - Different vaccum line connectors
     - Different fittings at throttle opening end of manifold
     - No hole for air temp sensor on MC manifold (there is now :)
     
     My probelm is with where the throttle flap bolts to the end of the 
     manifold. On the ur-q the throttle flap assembly it just bolted 
     directly, with three bolts. This is the same configuration for the MC 
     manifold except that the MC manifold has two holes (for vaccum lines?) 
     below the throttle flap opening. What are these holes used for, the 
     ISV? If I obtain the throttle flap for an MC engine will this cover 
     these two holes and allow me to cap the holes? Anyone have a used 
     throttle flap for an 86-89 5ktq?
     
     My alternative is to make up a plate to cover the holes and use the 
     stock ur-q throttle flap?
     
     Thanks and regards, Mike