I have a Dorman MAF and an ACDelco MAF which I thought was going bad, and I have a modded MAF that I bought with this ported throttle body, but I don't run that one.

I have almost/if not enough mods to run a 3.1. Here's my mod list.
-Ported Heads
-Full size IC
-Ported blower & TB
-Gasket matched LIM
-PLOG, full 3" exhaust
-AL 103's, 180 tstat
-Walbro
-SSAC's waiting to go on, gotta pull the motor and mod the firewall, this should be PLENTY to run the 3.1 pulley.