EGR and performance questions

So on my bone stock 318, 87 Ramcharger, I am going to be adding dual exhaust W/O cats from stock manifolds back very soon. I will also be changing the intake to a spreadbore from the 2bbl. The lean burn system is being changed out for a recurved distributor with a HEI set-up. My questions are, if I am doing all of this (intake and carb swap last) do I need to keep the EGR and smog pump hooked up?
Will I not gain some performance? My main goal is better MPG. I expect about 1mpg swapping to the HEI (going by past experience) and should be about the same with the dual exhaust. I have a cast intake and Holley spread bore that I might change to, but uncertain since it runs fine with the 2bbl.
I would love to hear your thoughts.
Thanks!