10.2 : 1 compression 360 at sea level. Options?

nm9stheham said

Don't let your guard down for a while if you put in the cool air. The AFR from the carb may change with a lot lower temp air..... it may get a bit richer or it may get a bit leaner....

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It went leaner for me, I up-jetted one size front and rear.But I thought the idle was more stable, and I was able to drag the rpm down further with the clutch; 4mph @550rpm,with 3.55s,when combined with a dial-back timing device to 5* advanced, from a normal 14*. And midrange was crisper.
Speaking of timing, you guys are spot on. With my power timing delayed to 3400, I can burn 87E10 with impunity (aluminum heads), on 10.9 Scr. I know I'm leaving a bit on the table, but I don't notice it. There was a time that the difference in the cost of fuel,(over $500C per year), was very important to me on account of the car was my DD. Over the course of 100,000 plus miles, I have saved a lot of money that way, way more than the cost of the aluminum heads, which made the running of 11/1 even possible.