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What I have found:

head heights
b7/a6 95mm
D14a2 95mm
D16y3 95mm
d16z6 93mm
D16y7 93mm
D16y8 93mm
D16y5 93mm
D15Z1 93mm

for every 1 mm of head height difference you will need a 2mm more belt because it has to go up and also down the head height information is from the factory service manuals

B2/B7/A6 tensioner OD is approx 56mm
Z1/Z6/Y7/Y8 tensioner OD is approx 52.5mm

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Based on this I figured I would need a 106 tooth, but the tensioner leaves me unsure. Since it's a y7 block I'm sure I need to use the tensioner for a y7, will that affect anything? Also I assume I'd use a y7 water pump, does that have any differences affecting the timing belt?

Since I'm staying obd1 in the car the ecu, dizzy, etc stays the same. The crank position sensor on the y7 block isn't needed anymore. Using the y7 oil pan. Using the y7 crankshaft cog for timing belt, using B7 cog on camshaft. (Aftermarket adjustable cam gear?- some info I found says there can be a 4.5 degree difference to be corrected here)?

 
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Forgot to ask, Do I need to do something with a oil injection restrictor? Have one in or not?