In the past you could buy some stuff from you local speed shop to help out your traction on a bias ply. Would fill a container and put your tire in and keep turning it now and then. I never used it much on my Challenger tires always had slicks on the Challenger. I would go and help out a friend I worked with that had a 1968 Camaro LS7 10 second street car. That car with bias ply L 60s would hook hard and never lose traction at the track or on the street. He did a lot of testing at the track using the juiced tires so he could be competitive street racing. Wish I could remember what the produce was from back then. Today you can buy good sticky tires and just put them on the car without having to juice anything.