When TFS was owned by the Smith Brothers, they created the 385-series head because there was NO aluminum head available and one of the brothers was a pattern-maker/designer and saw an un-explored market. I was writing for Super Ford at the time and got the first set of castings they produced. The casting was done by a local foundry that was familiar to them.
When I got them, they were all machined but the valve guides and seats were in a plastic bag and needed to be pressed in place and fitted for the valves. I took them to Holbrook's shop and 'Birdy' did them up. The second and third sets went to Roush for evaluation. He told me who to talk to, at 'The Skunkworks' on the bottom end of Southfield, to get the results of their work-up. I believe I wrote two or three articles about them for the magazine.
As I remember, they did better in the way of flow, with minimal work, than was possible from any iron head, no matter what was done to it, but I don't have the manuscripts any more and the magazines, if I have them at all, are buried somewhere in a box.
I believe the Smiths sold out to Summit.
KS