The issue isn't that the gasket isn't tall enough, the issue is that the way the intake sits on a ported head there is nothing for the top edge of the intake to seal against as its floating in the runner. Running a spacer, double gaskets and a distributor with an adjustable shoulder stop is probably not my preferred choice as its a bit excessive just to get an old 60's intake to work, back when the intake ports in stock heads were very small by todays standards. I did a lot more research last night and it seems like its a common practice on these intakes, tunnel rams and older casting intakes to add material to the outside of the intake and then port match the opening, "raising the roof" as its called. In my mind I'm starting to see that I have two choices, leave the intake stock and have it sit on a shelf until I swap back small non-ported heads or modify the intake permanently to make it usable on most current and aftermarket heads.
To top it off I'm not swapping this intake as jewellery so I'm strongly considering adding that material, I wanted to swap it in because its an intake thats proven to work, most people know the stories that all crossram cars had no bottom end and only woke up at 5000-6000 rpm but in fact they made more torque low down and midrange than a ported z28 intake and kinsler 8 tube fuel injection, on the top end only to be peaked by the fuel injection by a hair after 7400rpm. Aside from people who over carb them on the street, these intakes were made to work. The intakes are tricky but if you can keep the air speed up with smaller carbs like I have it should be very streetable and still pull in the top end to my lower redline. Obviously its difficult to compare it directly to todays intakes as the tech industry have taken design to a new level, but there is something to be said about nostalgia.
So after all that rambling it seems that I'd rather have an intake that works than an intake that looks cool on the shelf until I find something more-stock to work with...
I may have made my own decision