Well, it's been a few years in the process of getting these made up. 3D CAD drawing, now I am in the process of having a 3d Printed head! The valves I chose are 1.94 Chevy intake and 1.5 exhaust. They fit like a glove! Instead of the 3/8 valve guides as OE Buick, I am having 11/32 Chevy bronze valve guides installed. I am also going to use SBC valve springs, keepers, and seats cut to fit the springs. With the dual cut keepers, I feel better rest assured instead of the single cut keepers Buick had as OE. This way the parts are so much easier to obtain! Then you can dial in your own heads. If you have a race cam and you need higher spring pressure, then you can buy them! I seen a set of heads built in the 60's that had roller cam lifters custom "at home" made and they looked intriguing. I know the roller lifters are out there, so maybe this would be the full package left to be made? Even the little things like brass plugs, brass freeze plugs and so on would make the heads took great. Plus as an added, all of the bolt holes would be heli-coiled for clean threads! Hardened seats with extra casting around the intake ports (so I can go deeper into the head without getting into other parts I shouldn't. I am contemplating using Chevy valve lifters with "oiling" pushrods and getting rid of the entire rocker shaft assy. Custom rockers, and much more to make this a bolt on experience! I have a few sets of the original steel gaskets GM used and I may either choose these, or have some custom ones made.... Either way, these will be an easy install and noticable improvement on weight and performance. Didn't Marty say he was going to make a single or a dual plane aluminum intake?? what ever happened to that fiasco?? If anyone has any ideas, please share.