I have never purchased anything from H&H but I have talked to them on the phone, emails and at the Roadster Shows several times. They do know their flatheads and their prices are compe***ive. I suggest that you take the time to call or email them.
They come up a bit, here's a sample I found searching. https://www.jalopyjournal.com/forum/threads/any-issues-with-h-and-h-flatheads.1231202/ https://www.jalopyjournal.com/forum...rnal.com/forum/threads/h-h-flatheads.1207110/ https://www.jalopyjournal.com/forum/threads/h-h-engine-delivery-time-warning.111822/ https://www.jalopyjournal.com/forum/threads/8ba-v8-flathead-full-block-with-blower.1069788/
I have never dealt with them directly, but I did recently buy a car that has one of their engines in it and I can say that it is extremely reliable and runs really well. ironandsteele.com
I recently bought an intake from them and had it within a week, California to Maryland. Mike also advised me on how to setup my Stromberg's even though I didn't buy them from him. I would buy from him again!!
I have an H&H flathead in my 30 coupe and was impressed with their work and has been a great engine, they are a little hard to get hold of but can't complain about their service.