[daddy6stringer]

If it's worked for you in the past, then by all means...It is a good enough method.
Personally, though drill presses -can- be accurate, I find it requires a bit of setup to get it accurate to the point where I will trust it for anything but a "quick" job with loose tolerancing. That is why I have to recommend removing material from the nubs. It may be tight getting in there, but the material removal rate is slow enough such that you can accurately gauge it with the cylinder head every so often to ensure optimal fit.
Again, if it worked for you repeatedly, then it is a good method, and keep doing it. I'm a machining nerd, so I'm prone to wanting to go all out with it. But for those that aren't so inclined...slow material removal is probably the safest way. And especially considering that it's a Stainless Steel Cylinder Head, some serious problems could result from improper setup. IIRC, you're a bit of a machining type yourself, m102404, so it isn't probably that big of a deal, and you are familiar with the ins and outs of the machinery and the machinability of various materials... Etd may not be so fortunate...