You don't have to do engine work to support F/I unless you get into higher boost levels or if you run a large shot of nitrous at the same time. The stock rear end is the weak point with more power, but a 8.8 takeoff can be obtained for less than $1000 easily.
Upgrading to a GT is the easiest route of course, but that's not a point I usually make, being a V6'er myself  .
FWIW, a F/I 4.0 is quite fun!
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Mike - 2005 V6 Automatic, 300+ RWHP; 12.79 1/4
Vortech supercharger (SOLD); 180*T-stat; PLX Wideband O2, VEI digital gauges, SOS pillar pod; JBA 9MM wires; Mac LT headers, high flow cats; 8.8 w/3.73s, LPW girdle, alum driveshaft, 3000rpm TC; Steeda UCA, panhard bar, brace; CHE lca's & reloc brackets; Steeda Sport springs, Tokico DSpecs.
 .. "Sally" is getting "balls" ...forged V8 swap in progress 
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