St intake manifold on an mzr powered miata

I could use the existing adapter, I haven't actually seen it yet, only mention of it, my plan was to make one myself as I have the tools to 3d print one out of carbon fiber composit plastic.

And yeh, if it wasn't in the car and was taking the head off, ensuring there was no left over material from grinding down I probably would, I might yet do it if access isn't awful, clean the valves first, then make sure they are closed, then grind away, I have a half decent Dremel tool so not impossible.