I just bought a 1967 TR 4A and have never owned one. I live in Prosperity SC on Lake Murray which is about 20 miles west of Columbia SC. I will have many questions and will certainly appreciate any info from Y’all . My first question is the proper method of putting the top down without harming the vinyl windows? Also what grade of gasoline is recommended as the manual makes no reference. I have access to gas stations that have non- ethanol gas, but different octane levels. Should I use 89 or up to 93?