you might want to check the piston to block clearance, because of standart classes. ford standart classes 1-4 are 90.800mm to 90.840mm. cosworth blocks are only standart classes 2 and 3. (standart class 2=90,810-90,820 mm and standart class 3=90,820-90,830 mm).

when you have Efi pinto block, you might have there different standart classes, if the block is standard size bore block. otherwise the bore size is same in cossie block and regular pinto block.

maybe you knew this, but just in case for information.