Guys,
Thanks everyone for responding. I'm happy, I'm happy, I'm happy. That sums it up. Went out a couple hours ago and changed my spring to the long yellow one. Reset the idle mixtures with a vacuum gauge. 15" is the most it'd give me. It idles smooth, real smooth. My initial timing is set to 14 degrees with the mechanical welded up for a 10L weight. While I was at it I reset the primary and secondary float bowls have the gas just at the bottom of each glass.
I buttoned it all up and took it out on the highway. I rolled out in 1st, punched it and power shifted thru three gears to 4500rpm. There were no bogs, no nothing, it was just shit and get it. It's a lot more than what I had in my 300hp 390 but I still don't think it's 415hp like my calculators say. It's more than what my 66 Fairlane GT in 1966 had but I'd not think it's over 375hp. I know one thing. I wouldn't change any part of this build. It runs absolutely fine, cruising to the Drive-In Movie last night it showed how smooth it was on the highway. It'll still be a comfort and enjoyment to drive. I doubt I'll get 20 mpg like I did on the other engine, but I don't care. It'll take more than a paint job to run off and leave me.
O yes, the sound. It sounds healthy with the exhaust maybe hinting of a large motor but when you turn it loose you'll hear it without any problems a mile away. Sounds good when you're on it. It's twice as loud idling as the other motor. Thanks, Jim Machoneman, you were spot on.