Transmission debacle

Do you have a decent converter for either one? How about driveshaft?
So as for driveshaft all i have is my slant 6 driveshaft to a 904.
As for converter the 727 has ita stock 340 converter in it and the 904 has no converter at all other than i have a stock small stall one which from what i heard isnt a good idea with my engine