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FAST epoxies are usually not as strong as slower curing ones
For the BEST epoxies out there, I recommend McMaster-Carr; you can find the same type of epoxy material the manifold is made from there. I bought some of their fibreglass epoxy (3M Scotch-Weld 2-PART Epoxy Adhesive 1838 Green, 2-OZ Tube) for my railgun barrel, and it held together at 60,000PSI
As a mechanical engineer who only applies his learned skills in the garage . . . a big green beer for you and that neat webpage.