It could touch, valves/pistons, esp with tired springs at high revs, needs checking.
To get best from this cam ideally you need a a decent size carb, a excellent cam is the mk1 mexico spec cam, or BCF2, you can also use the old A series cosworth cam profile, longer duration but lower lift so fits easier but due to overlap emissions are high.
The x flow and xr2(mk1) engine are different and parts are NOT interchangeable, x flow is rwd and valencia is fwd, basically a shorter version of the kent, but very few parts fit each other.
A decent head, exhaust, carb, with a 244(mexico) profile or BCF2 will see you around 115bhp easily.
tabetha