The taller block allows to use long rods with a bigger stroke so rod ratio is perfect.
This will allow for high revs with big capacity.
For 2.7 you need even bigger bore and stroke but i dont know turbocharging would be possible.
The most important is gas flow of the head, bigger doesnt mean better. Rallycross engines mostly are build for torque and have a 45mm restrictor so are limited at around 580bhp and around 900Nm.