The H75 does not have a favorable combustion chamber (but there are worse heads) when up against comparison to the H89 and GX heads, however, once the face of the H75 head is machined and the cylindrical dish (surrounding and merging with the combustion chamber) is no longer existent you get a very nice combustion chamber equivalent or similar in appearance to the H89 and GX heads. The problem is the reduction in the combustion chamber may put your compression ratio at a level where you need high(er) octane fuel but this is also dependent on rest of the engines configuration- I did the calculations once but I cannot find them. Can do them again if you need (using the specs of my motor as a candidate for the head).

The H75 has bigger valves in stock form compared to a GX head in stock form.

I recently saw a H75 head off a race engine and it was one of the best ones I had seen, in terms of modifications. I wish I had bought it now as would heaved served better than the big-port head that I have now.

So I guess if the head hasn't been ported to all buggery and is still around-about stock size then sure it can work just as well.

Maybe upload some pictures and provide some specifications (springs, valves sizes, chamber cc's etc etc) and we can offer a more specific opinion.