with the stock configuration of the vehicles metioned, assuming you use a sport GP3300 pack, you probably can get about 10 minutes of running, maybe more. The thing is that you need to remember is that with the electrics you need to put in about 30 - 40 minutes of charging (depending on amp rate, I do between 5amp and 6amp) . That is the main part that sucks about electric is the charge time it takes. Thats why if I do it again, I am really thinking of just doing lipo and brushless.
Gas can be alittle more challenging, but, in general isn't too bad. If you have a LHS that can help you out it really shouldn't be a problem. Since its a simple 2wd vehicle, shouldn't be too hard to figure out either as there is less moving parts compared to a typical 1/8 scale.