I don’t remember any special drama when i did this on my wife’s 79 a couple years ago, other than the clutch sigma spring colliding with the SSI. Denting the SSI slightly with a hammer solved that issue, allowing the clutch spring to move freely.
I also used a few rounds of pb blaster, then heat, then tighten nuts slightly before loosening off - no broken studs thankfully.
Crossover oil line didn’t fit perfectly but i don’t recall special difficulty making the adjustments.
Gratuitous pic of installed exhaust:
