if you are very serious about this you need way more info!!!! plus one more complete donner roof and door sections!!!!.and in order too install a oval clip in a chopped late sedan you need some very good fabrication skills.it is damb near impossible too due without sectioning/distroying the oval section.it involves laying the whole section inward and fabricating a new lower vent section too keep it flowing.check out my car under member,jims chop
trust me there is more too this than its worth,you havent even thought of all the internal fit and finnish, i would never tell anyone not too due something ,because that is how you learn is by doing it.this is a 20 out of 10 on the modification level.my advise is too hit the wrecker and practice on a complete wreck first.`
if you want more detailed info post under my car in members section and i will follow it from there.
good luck,
p.s i'm not trying to turn you off this mod ,but just make you aware its a big job,i dont want too see anyone cut there car too pieces before they have all the info