Getting it warm in the sun +++. I also had access to a 1/2 dozen sand bags I used to weight it down over the hump, that also helped keep it in place. The last thing you want is to cut it short at the sill plate or kick panel (like the 69Camaro guy down the street from me!)
68 Firebird 400 Convt 33 option car:tilt, cruise, AC, 281 trim code leather interior, PDB,PS,P top,headrest, rear antena, Ralley 2's, TH 400, Speedminder speedo buzzer, clock, tinted windows, floor mats, remote mirror, door edge guards, remot decklid release, trunk lamp, saftey track rear, am fm radio, visor vanity mirror, custom seatbelts, console,heavy duty air cleaner, exhaust extensions, tinted glass- all. All factory installed total price $5121.18 !!!