The first thing I would do before spending a dime on that furnace is do a thorough cleaning and inspect the heat exchanger for cracks or pinholes, it appears quite rusty in the pictures. You can use either a strong light or smoke generators to check the exchanger. If it's no good why waste money on it. It sounds like you have friends in the industry who might be able to get you a new furnace at contractor cost which would save you a significant amount of money.
Just my 2 cents.
The old Comfortmaker rides again! :)
Replaced the ignition module, vacuumed & buttoned things up, it fired and seems to be running as it should.
I've also bought a CO detector with a PPM indicator. It's about 4 ft. from a vent and has been reading 0.
Thanks for all the replies and ideas. It is greatly appreciated.
HIP HIP HOORAY!!