Picking a cam and torque converter
Cant swap tailshaft housings. The tail on the 42RH and 46RH is the O/D unit. You would have to get creative making a mount. Theres a pair of drilled ears on the tail housing. You could get creative there even though its farther back. Maybe move the mount crossmember back, and make a support mount with an upside down U bolt going through those 2 holes in the tailshaft housing. Heres a pic of 42RH that will be going in my kids car. Note the mechanical speedometer drive in the tailshaft housing. Your 69 cable should thread right in. If it cant make the bend since the speedometer drive is further back, you can use a longer cable, or a 90° right angle adaptor.
Cant swap tailshaft housings. The tail on the 42RH and 46RH is the O/D unit. You would have to get creative making a mount. Theres a pair of drilled ears on the tail housing. You could get creative there even though its farther back. Maybe move the mount crossmember back, and make a support mount with an upside down U bolt going through those 2 holes in the tailshaft housing. Heres a pic of 42RH that will be going in my kids car. Note the mechanical speedometer drive in the tailshaft housing. Your 69 cable should thread right in. If it cant make the bend since the speedometer drive is further back, you can use a longer cable, or a 90° right angle adaptor.
