With a lot of things Mopar, you could have an early 72 build that used a 71 hood. They always tried to get rid of "old inventory" from the previous year. The clips and nuts might work just fine on your hood.
You seem to have typed an extra digit as Chrysler part numbers in the 60s and 70s only had 7 digits. Did you mean to type PK3410769? If so, that's a small block 727 used for 1970 340 cars.
What condition is the transmission in? Does it need rebuilt? Is it functioning properly? For just a core...
@Juan Veldez, go with either the 518 or 500 (46rh or 42rh) before 96 (i.e. 95 and earlier) and it's practically a bolt in deal. Just need to cut a few webs on the over drive housing and grab a new cross member and shorten the drive shaft a couple inches. Search for my posts, I have the pictures...
I wouldn't trust anyone to build an engine for me except myself and my son. But that's just me. I think Hughes sales some good Mopar only camshafts, but their are better folks for other stuff! Just my opinion.
Power steering pump?
By the way, I have an 89 Dodge Cummins, shifter like crap and probably in need of a rebuild, but I put a new filter and adjusted the bands and it's running pretty damn good with 260,000+ miles on it!!
One thing I like to do on any early 727 trans is add a deep pan from...
@transam, just know we are all agreeing you got a crappy deal that most of us have experienced. Fingers crossed the new side makers work as expected! 🤞
Regarding the transmission, looks like normal clutch material as you guessed. Hopefully you adjusted the front (outside the case) and rear (inside the pan) bands while performing your filter/fluid change. That will help with the slipping.
Depending on the age of the PCV valve, it could be...
Worth every cent!
https://shop.mmcdetroit.com/product/dodge-and-plymouth-e-body-challenger-and-barracuda-1970-74-reference-manual-restoration-and-judging-jme-1-1/