Lynn Dykes of Summerfield, Florida has modified his '67 Monza's trunk latch to release remotely with a keyless entry module from Pep Boys and other hardware supplied by Allelectronics.com.  The photos below show details of how to do it while maintaining the safety latch and the ability to still use the key to open the trunk the old fashion way.

If one takes apart the trunk latch it can be modified so that it will open by the key or by remote and still maintain the factory secondary latch. Once the trunk pops open, just reach under the lid and push the release rod to open the trunk the rest of the way.