My 70 Formula came with the exposed wipers, and the first thing I did was simply change the arms to a set from a car with hidden wipers.
They don't of course "park", but the driver's side arm at least comes to rest in a psoition that is parallel to the bottom of the windshield.
You can even push the arms down once they are in the rest position to hide them beneath the cowl.
I now have everything required to convert to a complete hidden system. If you want to add pulse/delay wipers, you'll need a motor and switch from a '79 and up Firebird, as I recall. The switch you can get on eBay (along with the linkage and the proper motor mounting plate), and the motor is available from Rock Auto at a reasonable price.
There is a really excellent thread on the conversion process somewhere. I'll post again if I can find it.
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