If I had a relatively hot 340, or anything else, and wanted the car to be fast and streetable, I wouldnt even think about a convertor under 4500.
My( admittedly very healthy) stock stroke 318 with under 10.5 compression( and a cam in the 230’s at 50) loved a tight 5k vert. Drove it literally everywhere, including the track.
Many people seem to not have a clue regards where convertor technology has come.
Any healthy 340 will respond favorably to a “ real” convertor.
Years ago I went the 3000 stall, then 3800 stall 10 inch stall stuff. Never again
They slip more, and are doggier than a good 8 inch….by a lot.
