Bill Dedman-looks like you have methenol injection also ???
What fuel pump and carb are you using??
I am on the fence sir. I am a little short of the cohoney's but close
The methanol injection I use is a Stage One (cheapest they sell) Snowperformance Boost Cooler, from a company in Colorado. It was $300.00, but seems to work very well to prevent detonation. It can be used with water, windshield washer fluid, or a percentage of methanol from 1% right on up to 100%. I have mine set to come on at 3 pounds of boost, (that part is adjustable, even on the entry-level units,) and that seems to work okay on my engine.
They have other, more expensive units that are more flexible, for people with more money, but this basic unit was all I could afford, and it does the job, nicely.
My carburettor is a "Carb Shop" (Ontario, CA) unit, modified for blow-thru... a 750 Double-Pumper Holley. $900.00 (!).