Dear Lord, Please allow me to hear this engine just once to know that there is someone just as nuts as I am.
Very radical. I think you may be able to idle in the 1000 to 1200 RPM range...as the car rocks with each loaping surge. I thought mine was high at .550, but .675? That's radical.
Yes, it will loap heavy and when you get just above the idle circuit, it will sound like cooking eggs ( a term we used to use a while ago ).
Send me all of the relative information so I can take an insurance policy out on your butt when you launch this thing for the first time.