I use to race a hemi Cuda 4 speed car along with a lot of other 4 speed cars a long time ago, I was told back then by several factory sponsored Mopar SS racers to start the burn out in 2 or 3rd gear, depending on the rear gear ratio and tire heights With 4.10 and a 29 inch tall tire 2nd gear work okay, 3rd would have got the tires hotter quicker I would use the line lock and let the clutch out around 5000 RPM and try to keep the RPM above 5000 and under 6500 RPM during the burn out