I am using A14 block and head.
A15 crank and rods. Though A14 rods are the same.
ACL # 2699 UC Mazda pistons which start out dished. I have milled them flat as they stick a few mm out of the bore if you don't.
If you take a look at my carppy site you'll see a pic of the block with pistons assembled.
Mazda pins are 20mm so the small ends of the rods need to be enlarged.
Mazda pistons are 77mm std so 40 thou overbore required.