Guess my ET....

Looks very similar to my current motor as well, except you have a 904 (I have a 727) and my Eddy's flow 293 @ 0.600, and my cam is a step bigger (264-268 @0.05 with ~0.630 lift IIRC). The only thing I would do differently would be put a Victor on it.....With that said, it would not surprise me to see it in the 10.4-10.6 range (really depends on what the heads flow). We will have to see come spring time.

Edit: just re-read...I thought you were going to use an Air-gap, that is why I said switch to a victor...carry on.:D