Choosing of converter help

I have 3 Ultimates and each have their intended purpose and characteristics.
My 727/6200 is on the loose side and I have a seasons worth of time slips from 4 different tracks that pound 1.34 60ft like clockwork. This converter was at 5800 and would 60 quicker, but Racepak data showed some launch issues so after some discussion I sent it back and changed it accordingly. It did slow the car some, but I’m running a 10.5 tire with a little power so it was a trade off that worked.

My 727/5800.... this was born of a guy that bought into his intel of my car running what numbers it did, but . Had a friend selling an 8” Ultimate so I bought it and he sent it directly to Lenny. Built it for my needs and tighter so I got my “fast” set up with very little slippage. The happy ending here was beating the crap out of a very confident Ford guy 2 passes into a 2 out of 3 1/8 mile heads up race.

My “new” 904 converter. For some stupid reason I swapped the 727 for a 904. Also changed a few other things but the car this past weekend was 1.24/.25 in the 60 and is a monster! Best passes ever in Tucson AZ. Might be interesting when I get to sea level.

Also had Lenny spec my converter in my Mirada..... around 1994 :)