I heard J&M was good but that goes to show ya that word of mouth isnt all its cracked up to be.
David No matter who you go with for a converter you need a higher stall period!
knowin cam specs is a plus but not nessesary.
car weight-rear ratio-trans type should be good.
also you do have a BIG cam in there and idle isnt what one would call smooth lol.
I never Had issues with TCI for TH350-400 trannys.
And you know first hand I beat the crap outta my drivetrain lol.
I did have issues with HUGHES and B&M converters though.
another good MFG. is COAN
http://www.coanracing.com/Catalog.asp?CatClass=02CO
the main point is to get a matched torque converter for your drivetrain setup.
cuz it sucks right now lol.
I used to have same issue with a bit higher than stock converter and had to set tranny in nuetral at the lights or stand on the brake pedal (non power drums lol)until car died.
you might have a problem selecting a converter from Yank cuz they dont make converters for TH400 .
only powerglide.