Rob,
I don't race my Ace but have tuned it up a bit.
Plugs: I got one of the longer reach plugs, but didn't get around to checking it in the head. I think its going to bottom out because the head is not tapped through. I use the 6 heat range as noted befor
Ignition: I put in a positive ground Pertronix. It gives a little better spark and eliminates the point problems. Downside is the ignition can't be static timed to get it close after distributor work. Timing is done dynamically with a strobe, some where about 50 degrees BTDC @ 3000 rpm.
Carbs: Solex with accelerator pump. 120 main jet and 190 air correction. The book main is a 125, but the plugs are a little dark
Brake pads: stock
Brake fluid: DOT 4, If I was racing, a dual master cylinder set-up would be a priority.
Gearbox: SAE 30 non-detergent
Diff: SAE 90 hypoid
Engine Oil: Shell Rotella 15w-40
Anti-roll bars and stiffer springs are useful on the track, but I took them off BEX375 for street use. I have the specs and drawings for these parts.
You asked about cams. The stock cam has these specs Lift 0.202, Duration @ 0.05 lift 193 degress, Lobe centers 110 degrees, Timing Intake ATDC 110. The Bristol sport cam is 0.209, 212, 110 and 110. My Isky cam is .236, 230, 110 and 108. Stock valve spring don't work with the high lift Isky cam.
Peter