I can recommend Joe, I done some race car dealing with him, the good thing about Joe, is he just doesn't sell the stuff, he actually uses it as well, and is wealth of knowledge. FWIW, I rather buy from a guy who can actually tell me how to make it all work from their past experience, there's alot of guys on Ebay who are nothing more than part peddlers, and never get there hands greasy, and have zero experiecne with the stuff they sell, and thats definately not Joe.
I had a customer buy a MGB cross flow head from one of the Ebay sellers, then later decided to get a set of the Harland Sharp 1.5 roller arms from him. Here's the deal the pushord holes in the x-flow head are smaller than the ones in a stock head, so when the roller rocker arms were installed, the pushrods interfered with head as for bottoming out on the pushrod hole bores, now I could have taken the head and enlarged the pushord holes and made it work, but the customer was so mad because he had been sold a part that seller did not tell him involved a modification to his head to amke work, he sold them in disgust. This sort of thing is a good reason why you might want to buy from a guy who has used this stuff on his own engines.