Depends. Original?, early repo, late repo. Two port Four port? And how complete.
The Riley heads are very good, make good power and pretty stout.
But, there were many castings sold not machined and that left some to be machined with questionable techniques. I have had a couple of heads come in for evaluation after the owners attempted to install and run. The operable word here is attempt, one did not fit on the block (stud locations) and the other, well lets just say some of the internal passages were interconnected (leaks of water into ports and chambers).
Caveat emptor would be the caution here.
John
PS, one ended up polished and looked great hanging over the mirror in the bathroom....
I don’t have any first hand knowledge about these heads or know anyone that has installed one. They are new builds, and the $7,500 price includes the push rods, head gasket, ARP stud kit, intake manifold fabricated for 2 Ford three-bolt carbs (Stromberg Pattern) and an adapter for an early Ford V8 water pump.
http://riley4port.com/parts/
I have an original Apr 1934 4-Port, that was machined well, bolt pattern true, the only problem was the intake flange that mounted to the head was “warped”, but was milled true with no problem.