Lost power all of a sudden. 273 commando.

Alright, some updates. My total timing of 35 kicks in around 1800 rpm. Here is a picture of one of the plugs. The spark was fine.

I have ordered a kit of seven springs for the holley carb. When I take of and has got up to a bit of speed I can totally feel the secondary open with a kick. I only had three springs that came with the carb, it's the same with all of them. Could the heat outside affect this!? Thats the only factor that has really changed.