'74 Scamp A904 issues

Hello fellas/ladies, to whomever may read this thread, thank you for the time, I know personally how precious it is, the one thing we cannot get back, so thanks for spending some it here and possibly even helping out an honest fella.
I recently pulled the a/t from my Scamp and I was looking for opinions on whether or not I should just change a seal and run it for a bit, or go through it with a kit? I'm going to upgrade soon, V8/727), but I need it running cause it's literally my daily driver. Selling the 'ol F100 that's currently my daily driver. Anyways, the seal at the shift linkage was leaking like crazy whenever I test drove the Scamp and I ended up having to put a couple quarts in it just to give it a good drive after bringing the car home. It felt good once I put fluid in it, shifted strong. I'm gonna be reading a bunch of threads but in the meantime can anyone tell me what this seal p# is? (Pic # 1&2). I already got a wrong one that I ordered, looks like I got a speedometer shaft seal, (last pic). Gotta get the right one none the less, and, are there any tips/tricks for changing it? I don't have all the best tools and I'm not a "transmission guy". I'll throw some pics of the linkage ready for seal removal. Any tricks/tips will be received very kindly. Also, see pic of inside the tranny, is that damage or something normal? (Pic # 3&4) and the shaft wear in the pics 5&6. I can hear "clanking around" when I shake the torque converter back and forth, is this normal?

IMG_20220518_130630577.jpg

IMG_20220518_131837416.jpg

IMG_20220518_143158185.jpg

IMG_20220518_143147972.jpg

IMG_20220518_143341079.jpg

IMG_20220518_143358165.jpg