I would leave them alone, it will look fine. That type of plastic releases oils and paint wont adhere very well and may flake in time. You can get away redying 40 year old panels that have dried out but even those tent to scratch very easily. Scott from Harms can chime in on the properties of plastic.

68 Polara 500...LL1 Y7 M6X
69 Hemi road runner...X9 X9 M6X
69 A12 road runner....R4 R4 M6X
69 ModTop FLORAL Super Bee...F6 M6W
70 AAR 'cuda...EW1 EW1 H4X9
71 Duster 340...FJ6 V24 L6X9
71 road runner FC7 V1X M6X9

72 Rallye Charger B5 V1W

74 'cuda 360...KB5 V1X A6X9
08 SRT Challenger #234