That should work nice! I think BIGs uses APD carbs and does individual mods when you order billet. I talked to them. I was also VERY tempted with TMC twin blade carbs. Wanted to order but this pair popped up and I could not resist a good deal :)
I wonder what is possible with TF 270 after further portwork. These heads are the most similar to Indy SR head I think. The most I saw with standard intake valve was just over 400cfm @ .800 lift with hand porting by Larry Smith with Indy SR. I was always curious what gains would be possible with 2.25" intakes and I will probably know next season. My idea is to do 572-13 intake opening, match the TR and use new 500ci short block with it. I hope I can find my 230 block in next months o finish the shortblock. Full rotating assembly is waiting.
This is never ending story..................