For what it's worth I'm running a converted Motorcraft distributor now.
The distributor I bought from HEIDIZZY decided to eat my cam gear at about 100 miles into the EFI conversion. The HEIDIZZY guy provided all the parts to rebuild the distributor I bought from him. However, when all was said and done I didn't trust his product enough to risk destroying my engine.
As far as I know there are still no reliable vendors that produce a Small Cap EFI distributor for the AMC V8. Granted this is probably no big deal since it is so easy to convert the Motorcraft distributor, but it would be nice to have that option.
One last thing on mounting the 7-pin HEI module, on GM applications the module is mounted to the distributor with thermal paste between the distributor base and module. For our applications where we mount the 7-pin module externally it is important to have a good heat transfer for the module. Also I'm a little weary on mounting the module too far away from the distributor because of niose interference on the two distributor pick-up wires.
1991 GW 401 /727TF/NP229 /4" Skyjacker /EBL TBI /CS-144
1981 J10 401 /727TF/NP208 /6" Superlift /CS-144