Tuning tips for my 1970 Chevrolet Chevelle on Need for Speed Prostreeet?

Hey I need tuning tips for my 1970 Chevrolet Chevelle on Need for Speed Prostreeet It has a couple level 4 parts but the rest are level 3 I can already run high 7s but i feel it can go faster than that.... Please help!|||My mustang gt ran a 7.44 at its lowest and all my levels are mid 4.