Exhaust manifold gasket leak? If so, try a Remflex gasket, rather than an original style gasket. It is more expensive, around $35, but will seal gaps from corrosion or warping of the manifold up to 1/8 inch.

Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix