Yea .4 to .5 is very ralistic with those bolt on's. I picked up .3 in the 1/8th with converter and shift kit. You also might want to get a Aux tranny cooler put on as well. They are pretty cheap, I think I paid 50 bucks, and that will help keep the tranny cool. Heat kills these trannys, and a converter will generate alot more than the stock.

 

i know u probably already have it but instead of a vet servo go with a super servo works much better

 

you say it works much better but doesnt the vette servo work much better than stock too anyways? yes as with any converter a tranny cooler is a must. you should also consider the HD-2 shift kit