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EDIT: Just reallized this wasn't a built block... You should deffinitely inquire about the A/F Ratio with your tuner bro. No expert here for sure but i know that anything above 11.5 or so on a stock block is getting dangerous. Good luck
Your engine bay install looks great the cosworth is simply in a word, beautiful! Heed the warnings of Doug and everyone else that has mentioned 12:1 being to high and have him retune at most 11:1.
Better safe than sorry, better to enjoy it for 10's of thousands of miles than 5k miles.
AS much as i dont like this guy, tailpipe sniffers with cat's will show upto 1pt leaner AFR. With the amount of cheques this guy has written for his car, id say that the tuner verified the AFR off atleast one of his widebands.
Pitty about your DEFI's. DEFI quality showing its true colours. All show, and no go.