Digging deep into the memories here!
The engine was a 2ltr, the GM carb, inlet and head went in the bin and a fresh engine built with a 1.9 inlet, big valve head, new 38DGV and Piper cam. Ignition is hazy, there were a few combinations, most likely being Lumenition in a resprung 1.9 dizzy. A Holbay cam went in shortly after. The flat spot could be driven round easily, it was more of a hiccup. The progressive linkage was a trial that gave way to EFi then a V8. The other engine was a friends 2ltr with a Granada 38DGAS we filed the butterflies on to alter the progression timing. The joys of tuning on a budget!
Were you racing your CIH?