Jim, good to know that about the rules, have always wondered how strict they are, it makes sense they don't worry about scrutinizing the budget unless you really are testing the limits of reason. Guess it is supposed to be about having fun anyway, not about fighting with the judges...
Would be fun to hear more about your A2 TDI swap, what transmission are you running? 020 or a TDI 02A? Axles? Subframe swap? Maybe we need an off topic section here to talk about other projects that are not powered by D24 engines...
MLS D24/T headgaskets have been NLA in the US for a while although you can still find them on German Ebay and other overseas sources with enough effort. The fiber headgaskets are almost as good though, especially with studs, as long as the engine doesn't get overheated or have other issues:
Most important factors are that the head isn't warped, head and block mating surfaces are flat and clean, torque procedure is carefully observed (including having fastener threads very clean and using the correct special ARP grease in the right places if running studs, so that the nut torque values result in the correct actual clamping force), and camshaft and injection pump timing are set correctly so that peak cylinder pressures stay within design parameters. Boost and fueling need to be kept within reason also. Any sustained visible black smoke at all under full load means very high EGT and head temps and will stress the head, head fasteners, and headgasket excessively and eventually overheat pistons and score the bores. This last piece is a hard reality for a certain percentage of people to understand and accept if the whole reason they bought a diesel was so they could crank up the pump to blow thick black smoke and poison pedestrians, etc, but those folks deserve to suffer some consequences anyway. Of course you also need to measure piston projection and select the correct thickness headgasket.
With all those things done, and with the cooling system kept in sound health at all times, these headgaskets hold up just fine regardless of what material they are, even at much higher than stock power levels (with careful and reasonable timing/fueling settings and head studs). In short I wouldn't worry about using those fiber gaskets if they are a reputable brand in an unopened package and if the supporting factors above are good to go. Some brands of fiber gasket have different designs and appearance for the fire ring, steam holes, etc, but all work equally well. Elring and Reinz gaskets for example are both excellent yet look quite different.