If the camshaft has lost a lobe it could do it again if the right process is followed on the new camshaft break-in. You would want to check the valve spring pressures as well. You will want to use special break in
oil for the new camshaft with a high level zink, like the Jo Gibbs break in
oil and there are a few more. You will need to run the engine at about 2000 to 3000 rpms for about 30 minutes to break the camshaft in.
All canted valve engines like the BBC, 351C and BBC engines are harder on camshaft break in and longivity. You will know more when you take it apart.
Good luck, Keith Craft