I have seen .30 ET change with new tires and the right pressures BTW, don't be suprised if the neck hurts a little after a good hit Neck snapping torque and traction, just like all the other good Mopars BTW, why does the other converter need fixing? Is it broke or are you not sure? If any doubts send it out On the first seriuos race car I work on we had a bad expereience with a well known transmission company who had just started making "race" converters, his converter was slower ET and MPH than the stock street Hemi converter we had we ended up going .7 faster and about 1 MPH slower with a different brand really good 8 inch converter versus the stock 2400 RPM street Hemi converter Buy a really good converter to start with I'm glad the car is going faster and your out there testing, tuning and hopefully having some fun

any pics of the car? You should definitely be able to get into the high to mid 11's with that thing,my superbee was 3825lbs with me in it and got to 11.60 and it was 446 cubes with a six pack.That converter is definitely an item to change,maybe something like a turbo action 10" or a 9.5 dynamic.Both would provide a great launch and still very streetable IMO.Keep chipping away sounds like you are headed in the right direction.By the way,what Carb and intake do you have on it?If you are running a smallish carb you can pick up a few tenths by upgrading.What fuel pump?We here at moparts are all experts at spending other peoples money,so lets get you down into the mid-11"s !!!

When I put that other torque converter in my 60 times got way better with my old 440, but my mph dropped and I really didnt go any quicker mid 13 was my best, But I did learned after I pulled the 440 that one motor mount was loose and that the more 110 fuel the slower i went too, Dont know if it need refreshing but I would get it gone thru anyways if I were to put it in. there a video floating around called The Hulk and The Farmer, ITs a commercial for Pinks All Out and it a small feature of me in it and my car, Just found this out at Pinks Saturday.
http://www.streetfire.net/video/hulk-and-the-farmer_701942.htm

Carb is a 950 HP Done by BIGS aka John a member here on Moparts he came highly recommended by others he knew my setup and all, intake is a M1 single plane stock.