Couple passes at the track today

I'd look into the ColdCase radiator. They are here on FABO and have a forum. I'd contact them. Really nice stuff.

What gear and converter are you using? By your numbers using the Wallace calculator, your showing 411 HP from your ET and 423 HP from your MPH at the crank.

That's about 40 HP over advertised.

Also, from the video, your converter is too tight. Listen to the engine from the dig, it struggles for about 40-60 feet and then it starts making steam.