DIY LTCC or similar system for LT1s

[spfautsch]

I figure somewhere in the memory, the math for crank velocity can be accessed from a vortech 0411, and spliced into a ls1 binary, and possibly work. ... I expect a loss of resolution, but wonder if it can be managed.

It's not necessarily "like that". The PCM in a 4x CKP setup can run the engine all day long quite happily firing the injectors in batch mode because the distributor knows sequence due to it's inherent mechanical design. And even if injection sequence was off by 90 or 180 degrees the engine would still likely run albeit less than ideally. The same cannot be said for a coil per cylinder setup and ignition timing - without the PCM knowing sequence implicitly it's all or nothing.