Friend bought a chinese HEI for a 351 Windsor Ford. Looks like a Ford distributor from the shaft down but a GM HEI from the base and cap up. Had GM hei style cap with coil in it, GM style advance weights. First one ate itself - something became unhooked from the vac advance unit and the connecting rod spun around and shredded the module, wiring and internals of the distributor. Second chinese one had the advance weights BREAK right at the pivot points, also flinging junk inside the thing and basically self destructing itself.
That chinese knock off garbage? Run away, and fast...