Tim,
Man - you sound like you have it covered. I have the 3 inch thick radiator and
oil cooler also, but no inlet shrouding or fan shrouding. I do have the radiator shroud on the inlet of the bottom only.
Does your overheat all the time? You have all the shrouding and it sounds like it is overheating more than mine. Until the mid 80's I never got above 200 with the new motor and it still did not get above 210. I would call Ron S at Griffin - 18007223723. He is hard to get to and only there Monday thru Wednesday. He says to call him between 8 and 8:15 EST to get him quickly!
I know one thing - I have a Griffin in my boys 69 Camaro and it is a whole lot bigger and has dual fans and is rated at 600 HP.
We will keep working through it - but we will get it worked out!
Bruce