Strange.... I had 2:73 gears and a milder set up than yours (although a 455) with a stock converter and mine would FRY the tires at will!!
I would have someone that was good with these have a look at it. I do believe with more gear and better flowing exhaust it would help out, but really headers will gain you maybe 35 hp at best. Somthing else is happening here...
Also I would think twice about changing the gears, I went from the 2:73's to 3:42's and have regreted it ever since. That would be the last thing I would change! that engine should be making AT LEAST 450lb of tq, plenty to handle those tall gears!
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