Maybe someone, with a similar combination, would be willing to make a spark plug recommendation...
69 Camaro - Manual Transmission - 3.73 Rear Gear
Gen VI Big Block - Iron Block
.030 over - 489CID
AFR 290cc Oval Port Heads
Eagle 4.25" Forged Rotating Assembly
I have a 69 with what I believe to be a 73 454 engine.
It has a cam, head work, headers, dual 4's on a low rise and it's hooked up to a turbo 400. (I don't know the stall speed) I have a 12 bolt with a high, but unknown, numerical gear ratio. (It HAS to be at least 4.11's)
I also just...