Yeah.. Simple thing like using the proper filters (dual intake so two-hole) ... Valve body swap is fine, you just have to make sure it is a 64 - 65 dual pump valve body. Getting good cables is a challenge. They are a bit pricey if they are leaking. Early speedo gears are different... What else? I rebuilt the ball and trunnion on the driveshaft...that was a challenge but not really that difficult ( I had a rare flash of patience).
We need to set up a collaboration site so we can develop that book Chris. There are definitely some hard lessons I've learned for sure, from the dash mechanism to damaged cable lock springs