First, if you get this gasket and you are wondering what gasket works for the crossover - see Remflex #8068.
We have used these gaskets with headers before - and they not only solve ALL leaking issues, they adhere to the block and header. These gaskets fit perfect on my 1958 Ford 292 V8; which is so very stock that it has 3300 original miles on it. Are they the last exhaust gasket I will ever need on the engine? Likely.