Heres where you went wrong..
1)Calling Pito Racing
2)Its hard,BUT you can kinda tell if its bridge by the lumpy idle.Its hard to understand if you dont know.
DO YOU want to be 100% sure?
Go buy a OEM Mazda intake/to engine gasket.They are like $3-$6.
ALSO get new orings for the intake.
Go to Jeff at Maztech he should have them.
Pull the intake OFF.
Put your finger in the port,You should feel the bridge.
Keep in mind,this is a 6 PORT motor. Most people ONLY port port the center plate (center iron)
Cause the end plates are for the 5th/6th ports with the sleeves.Which cant bridge.
What do you want for the block?
If you plan on going 13bt.
I have a standalone you should be interested in for ALMOST half the cost.