new to this forum...looking for some "expert" opinion...I have 3 unopened AMT '64 corvette 3 in 1 convertible advanced customizing kits (model no. 6914-200), I've had 'em for maybe 35 years...the boxes are in the condition they came in way back when and now I'm curious as to their worth...any opinons will be greatly appreciated...regards

Try a search on ebay for the kits. It's usually a good judge of what they are going for.