Well I have heat again after 10 days without it.
I found a complete ignition kit at Graingers for $150. Ignition control panel, gas valve , and ignitor. It's a Robertshaw package (P/N 712017) and replaces the SP735. (which is obsolete).
It took 8 hours to install, as it was a different wiring configuration and nothing really fit correctly without some modification. Trying to install the damn ignitor was the worst part. But we have heat now. Personally, I could have got through the "winter" without it (78 degrees today) but my S.O. sure is happy!
Did you ever see OHM'S mother in LAW?...... SHOCKING!