Good news - I got it going! Converted to magnetron ignition and gave everything a bit of a service/clean out. Will spend more time on it over the weekend to fine tune some things and then will continue with the takedown of the motor and mower parts prior to cleaning and painting. Pretty happy with my efforts, but I haven't had it running for any length of time and I haven't engaged clutch yet either....Hopefully everything works out this weekend so there are no other major hurdles.
The only thing I found odd - the mower only started when I left the choke in. When I bought the mower, the owner specifically said the choke needed to be pulled out to start and then pushed back in to continue running. This is the same for the second mower I bought. Can anyone justify this?