Latemodelrestoration has some great instructional information on how to install Challenger gears, sill plates, racing pedals, T-handle shifters,etc.

See:

Gears- http://www.mylrs.com/blogs/lrs/archi...ing-gears.aspx

Racing Pedals- http://www.mylrs.com/blogs/lrs/archi...pedal-kit.aspx

Sills- http://www.mylrs.com/blogs/lrs/archi...ll-plates.aspx

T-handle shifter- http://www.mylrs.com/blogs/lrs/archi...hallenger.aspx

MAC Cai- http://www.mylrs.com/blogs/lrs/archi...r-that-is.aspx

Budget Exhaust- http://www.mylrs.com/blogs/lrs/archi...-a-Budget.aspx

Predator- http://www.mylrs.com/blogs/lrs/archi...the-devil.aspx

Cargo Mat- http://www.mylrs.com/blogs/lrs/archi...ger-trunk.aspx