I just checked it, TDC is good. I was thinking the same as you. I stopped worrying about the numbers on this engine, only using them for reference. I set initial to max RPM, and max vacuum, then back it off to where it doesn't kick back. I find my overall by driving up an incline in first gear, with the RPMs up, If it pings, I back it off. I welded the plates in the distributor to limit the distance between the two, and removed the large spring. I have not recorded the actual curve I have yet.