WTB Small block cast valve covers that fit TF with Mancini/harland rockers..

The stamped Proform are not very rigid, although the Trick Flow head does have a really nice flat gasket surface.

Another option is Ansen cast aluminum valve covers. For about $180 you can get finned with no logo. For about $200 they now offer finned with the engine size, which is pretty cool.

Mopar Performance Valve Covers