SBC losing power
Spark plugs are white looking for sure. I may get a electronic fuel gauge so I can measure fuel pressure going downt the track.
On the timing, I have the vacuum advance disconnected and plugged. The initial timing is set to about 15 degrees and by changing the springs in te distributor, I have about 35 degrees total. It is all in at about 3000 RPM. My stall convertor is a 3500. Trans is TH350 with quick shift kit and rear end is a spooled 4:11. Traction seems ok.