Rare blazers???

[Huck]

Waterproof dash was standard issue on blazers--had radio speaker mounted below--and all the dashs (blazer and trucks) have a whole in the lower corners to allow the water to drip down that leaks from the leaking windshields. (heheheh)
Floor rust holes are actually planned to prevent water build up on the floor---if you remove floor mats, carpeting, etc. water will evaporate and you wouldn't have rust there!(hehehehe)
That's why the stock torque boxes have holes in them--to let the water out--but you need to flush them reqularly to avoid dirt to build up and hold the moisture. I've parted out dozens of trucks and probably 8 blazers recently and cab supports, cab corners, torque boxes, rear bed floors---almost always have dirt-mud-wet rags-crap---holding moisture which is the prime reason for the rust.
Now in my humble opinion, the rarest Blazers are not the early ones but the rust free ones. Those are the ones that are most valuable ---. Wes's bare bones blazer is really unusual and neat---but if rust free---then really valuable. Any normally rusted out blazer (no matter how equipped) is only worth the value of the parts less the work to remove them---my .02. These are not 63-7 corvette's with build numbers that are critical to bring mega $$$. The nicest original or perfectually restored Blazers rarely bring more then $25k despite the reality that it often takes twice that in investment to build one. Fun to have, fun to drive, great for off road, cheap 4x4 with tons of potential butttt---not the greatest collectable investment vehicle.