Initial timing

Measuring coil sec resistance with a DVM gives a misleading reading. Should be done with old fashioned V-O-M moving coil meter.
Canister coils are very reliable & I am sure there are many in trash bins that should not be there....
try running a GOOD vac advance canister . My 273 commando had the same problem of it breaking up badly when rpms came up.. I switched the vac can and it ran beautiful.