I actually JUST bought my 84 2m4 about a month ago to do the conversion. I have it planned out for what I needed but decided after thinking about it for that month, that it's just not sensable to spend $5000 on the Lipo Batteries right now. The batts keep coming down in price but they are still too expensive.
I will EVENTUALLY build a EV car that will make it over 100 miles with a charge so I can drive it to work. I work 50 miles from home and would need it to make at least around 120miles per charge and also be worth spending about $8000+ to build.
Right now with a Iron Duke getting about 32mpg I will stick with Gasoline but keep the EV in the back of my mind. eventually we will be able to use Lithium Polymer that has twice, if not 3x the capacity of LiPo batteries do now.
The Battery technology is moving up and getting better but it's a slow process.