b&b make a set that have a angel on them and will alllow for larger valve train ( aka rockers) and will still allow for lighting headers i have a set of lightings on my ford but seeing as how i use a adapter to allow chevy headers to fit on my ford they do not cause a problem.
iam pretty sure these will solve your problem but cant be sure . these valve covers arent cheep either like 175 and up! good luck! wink