Manifold doesn't line up

we have 875hp big blocks and haven't used the end gaskets in at least 20+years,,,we use the right stuff,,and it holds up to 8300rpm for 2000 laps on our race cars,,I've never seen, nor heard of it failing when used to fill the ends,,and we have cut manifolds, heads,,,,sometimes that right stuff looks 1/2" thick on some motors,,,and never had one leak ever,,,and we've had probably 30 motors like that