I've never tried the two together but I have done the TFI upgrade only and I have definetly seen improvements in idle smoothness and freeway speed passing power. I'm going to swap out the duracrap module and replace it with a MSD6A eventually.
1989 Black Grand Wagoneer, BJ's 4" lift, ProComp ES3000's
31x10.5x15 BFG AT KO's,MSD 6A,TFI upgrade,360,727,229,2.72 gears.
2006 Dodge Magnum R/T
2000 Jeep Wrangler
1988 Cadillac Brougham
1966 Dodge Monaco 500 383
1965 Pontiac Tempest 326