The 290's will give you much better velocity than the 088's and better flow overall. You should still call Bob Madera, why do want to screw with a bunch of jokers who could be jerking your chain when you can talk to one of the best and get a real education to boot. The reason you aren't getting any more responses is that you already got your answer.

I second call Bob his the best, help me i lot on my build this past winter

496 stroker with m3sc procharger its like a timex

I think its those old 088's aswell in a ported form that flow a bit. But iron eagles

Get the flow data on those