heads for 340

It's not true that ANY head you buy that can be bolted on needs to be checked over. Depends on if it was assembly lined or put together by a good shop.

If someone bought an RHS head and it stuck the valve there are some reasons it may have done so, tune up and sizing are two. They come bare, unless something has changed, so someone had to have put them together.

EQ's are a solid head that works well but use magnum stud rockers in stock form.

Start the flag waving! LOL

Any of the factory heads listed in the initial post, except the 308's, are basically the same when valve size is comparable. No huge differences in stock form from a port perspective.