I've lost my boost

As the title says, I've lost my boost. My setup is a Dyers 6-71 on a 340. Up until two weeks ago everything was running great. I had 9 lbs of boost and the car was a real beast. Then my EFI crapped out on me. My handheld programmer no longer worked but the car still ran fine. Then while I was at the Atlantic Nationals in Moncton the ECU stopped recognizing there was boost and the car would fall flat on it's face when I went to WOT. I got the car home no problem and ordered a new ECU from FiTech. It arrived and I installed on Monday. It runs a little rough at idle but that is a matter of tuning. Now the boost problem. All of a sudden I am not getting any boost. The best the gauge reads is 0 lbs at WOT. The gauge reads it's typical 8 to 9 lbs of vacuum at idle. I checked the connections for the gauge and all seems right. When I go to WOT now there is no boost. The car runs like there is no boost as well. I would guess that it it is running like a car with about 400 to 450 HP not the usual 650 to 700 HP. I did not hear any bad mechanical noises and the blower still turns freely with no noises. Does anybody have any ideas as to what I should be looking for? Stumped so far.

Jack