After checking other areas I removed the OVP relay. Fuse was OK but decided to have a look see inside. Had to cut the can off but found some crappy looking solder joints. The date code on the relay was late '89 so i've order another. After touching up the solder joints (none looked like they would have caused an open circuit) I replaced the relay and the car started right up. It even seems to have rediscovered it's "cold start" high idle mode. I've also ordered all of the normal tune up stuff to give it a good maintenance update. I'll reply back after the new OVP comes in to confirm the fix.

Thanks for the replies. The website is excellent and extremely helpful!