I waited and talked to Mike Kirby (Sissell) for about a year for a 12 port head ($3500). You still have to buy manifolds. He told me he had 5 castings left but it was questionable if any of them were good. I will be running a 4-71 blower. I am having Gaerte Racing Engines build the 292. I spoke to Tom Lowe about a lump port head and he told me that Gearte would be better suited to do the head for what I am doing. James Larrow is doing the blower (jj inlines) and also a serpentine harmonic balancer for the accessories. Crank fired ignition and external oil pump driven by blower belt. 3 X 2 bbl Roch carbs. Tremec TKO 600 and Frankland quick change rear end. Goes in my 53 Chevy pickup. Good luck and go for it. It's the journey.