Lets talk stall converters
https://www.dynamicconverters.com/
https://www.ultimateconverter.com/
https://ptcrace.com/
the three companies above are the ones that always get recommended in converter threads. i have personal experience with dynamic and have had awesome results. have friends that have had great results with ultimate.
call any of those three. be 100% honest with yourself and them when giving them the information on your combo and just as important intended use. the converter can and will make or break the combo. if not 100% honest about the combo and intended use you run a good chance of not being happy with it.
the current converter i have behind a pretty stock 360 is a 9.5" unit from dynamic and will flash to around 3500 rpm but drive around on the street like a stock convertor. hell we did a 5000 mile road trip in the car last october and it performed great. i don't even run an aux cooler.. only running the stock cooler that goes through the readiator. when i called and ordered my converter i was very clear that the car was 99.99999% street driven and that i'd like it on the tighter side.
modern good converters are very effecient. gone are the days that 3000 converter was considered the limit for a street car.
a good converter isn't going to be cheap but they work and work very well.. you have already spent hard earned money on a build, don't short change it with a cheap converter. the proper converter will really wake a car up. i see way too many guys over the years spend all kinds of money on the engine and trans only to put a crap converter in the car and leave a ton on the table.