A few years ago i swapped in a set of 5.13,s i had laying around from my normal 4.56,s. My car was similar to your combination,it ran the same with either. It,s been 5 or 6 years since i ran the quarter but at 10.21 at 129 mph trap rpm was around 6700 or 6800 at the finish line. This was with 4.56 gears 14x32 tire, i would go with the 5500 converter as my car picked up over a tenth when switching from a 5000 to 5500.Good luck and your car looks good.