i replaced the entire system on my 78, both actuators, all the lines, the headlight switch, regulators, check valve, filter. the only thing i kept was the over ride switch, lol. here are the costs, i'm sure if you look around you can probably get some of it a bit better and some of it a bit more costly. i was lucky to find a guy who had bouight a box of 50 OEM passenger side actuators, so one only cost me $50. believe it or not, it wound up replacing a brnad new "reproduction" actuator that failed in less than a month. i don't care what anyone says, the chinese make crap! the other actuator only cost me a seal and boot (but a new one can be found for around $100. trhe regulators are about 50 each (2 req'd) the lines (in a kit from doctor rebuild) 48, the filter and check valves were around 30 total if i remember correctly. the headlight switch was from a slavage yard (about $25) but repro are available for around 50. add it all together and to get the system back to original and working just fine was loads less than any type of electric conversion will cost you, and as previously stated, if you do sell the car to any vette nut, chances are they will look down on the mods you made.
i know everyone says the work was easy, but in this case, it really was only time. nothing was hard to accomplish. the toughest part was re-installing the actuators because you need to remove a bit before it will fit into the grill opening to be installed, but it wasn't a big deal, just the grill, the grill mounting brackets and the inboard actuator support rod.