273 exhaust manifold gasket

Hi All,

I have some coolant getting in the exhaust and down the side of the block from the forward manifold bolts. From what I gather, these bolts go through a coolant passage and have to be properly sealed or they leak. What gaskets and sealant is the best fix for this? I've seen talk about the "Aussie" Gaskets but don't know exactly where to find them. Thanks in advance

Seabee