W2 head question

I have 3 sets of heads , I have a set of X heads, a set of J heads
both with the 2.02 valves , I also have a set of U heads with 2.02
valves that have been port. My question is : are a set of W2 heads
with a strip dominator port matched intake going to flow better then
my ported U heads . I am putting together a 30 over T/A 340 motor.
(none of my heads are T/A heads.) I know the W2 heads have the off set
rockers simular to the T/A heads.
Will they produce more hosre power and Is it worth spending the extra money on them. Just going to be used on the street, with a 904 and an 8.75 rear end.

Thanks in advance.