EGR

["Rich Vandervoort" <richvandervoort@hotmail.com>]

I just got a set of the new style Vortec heads for my 4.3 v6. I just found 
out they don't have an EGR passage.  Is it worthwhile due to emissions or 
driveability concerns to plumb the EGR externally?  This is a TBI motor that 
only has a on/off egr valve.  Even if I do plumb the EGR externally will I 
run into further problems due to the temperature, flow volume and pressure 
of the EGR differing from the original?  Can a well tuned motor still pass 
emissions without EGR?  What are the benefits of EGR beyond emission 
control?

Thanks
Rich Vandervoort