Draw-thru or Blow-thru--whats the diff ?

I now have a s/c'ed application with what I guess is a draw thru Pro-M 80mm. (the filter is clamped to it on the end of my power pipe) ??
I am thinking about going turbo !, can this style of MAF meter be mounted "after" the turbo ?
Would 2 Grand National turbos work OK for me ? (Garrett T-3 that are 60 a/r)
Or should I just use one......this will be a home made kit.
Is this even going to be worth it ? Will I make any more power ?
My buddy has 2 turbos that I can get very cheap that are almost new.

Thanks for any help,
Frank

If you are going to try and mount the MAF after the turbo, you will need a blowthru. You are correct in saying that your present MAF is a draw thru, since the supercharger DRAWS the air thru the filter and MAF. The blowthru has air BLOWN thru the MAF to get its reading.