Hi-po exhaust manifolds

But will antiseize hold up to the heat from the exhaust?
Yes. Used it all the time on the turbo mounting studs for transport truck engines and construction equipement. Those at night are visibly cherry red for hours at a time under load. The antiseize has the grease carrier cooked out while the active antiseize component coats the threads and stays in place. Kind of like a galvanized or titanium coated bolt.
Smokey Yunick stated every bolt or nut should be installed with an antiseize or loctite on the threads. Heat can be used to release loctited bolts or nuts so does not function on exhaust.