Mel,
This should not be much of a problem. Follow these steps:
a. Take the carberuator off.
b. Split the exhaust pipe from the exhaust manifold.
c. Take the bolts exhaust and intake manifolds to engine.
d. Take out the round spacers from the holes in the head/manifolds.
e. Take the manifold as a unit to a machine shop and have it planed. (this is the most important step) Have them replace the studs with new ones and give you new brass nuts. (cheap)
f. Order a new set of exhaust/intake manifold gaskets from NAPA or some other source. The set should come with a new exhaust donut. If not, order one. (again, cheap)
g. Reassemble. You should not have any more trouble for a long, ling time.
You're welcome.
Charlie
