Yes plenty, t34 will do 400bho with a very well specced engine where the t38 will do 440 on a near std engine

The t34 I love, the low down punch is great, the t38s are fairly leggy, a t34 would trounce a 38 car on short bursts

But a t38 will give the top end power,

But if you just want 380 on either then your obviously just going to loose out going for the bigger turbo running less boost

Like I say I love t34 engines, we done loads of these conversions on ice blues and every customer hadps been over the moon!