Got Shell 93 Octane and now barely idles 1973 Dart 340

It will be
2. The flexplate being provided is imbalanced and intended to be used with a neutral balanced TC, in which case you get a neutral balanced TC or knock the weight off of your 340 TC.

I called this morning to confirm and added on Mopar Performance cast black valve covers, which go good with the paint which is B5 blue with a black duster 340 stripe and black interior.

Can't wait it's like waiting for Christmas.
Eric