A T34 is too much for a CVH head on most engines. Obviously there is exceptions.
If you want a larger turbo than the 4x4 T3 Compressor wheel & housing, i would advise the T35 as it is much better design for our fwd setups than the T34 is.

I built a Fiesta ZVH with L6 greys and T35 with .63 and made 320bhp almost 10 years ago now.