For how cheap they are I'd replace all the valves, not just the exhaust's. Even cheap standard replacement valves are better than old well used ones, it's cheap insurance.
Neil.
i'd replace at least the exhaust. If the valves don't seal, you might as well not even bolt a 4bbl on or install any aftermarket cam. Valves don't seal, you have a gas-guzzling, low performing, hunk of iron
