I have a bad fuel pump. I think there are aftermarket electric fuel pumps that would work in my 78 Scout. Is there any special procedure to get this to work, or is basically mount, plumb, and power?  

You have got it. Get on with a 15 or 20 GPH rating and about 5.5 PSI.  

Do you think I would need a fuel regulator? Some pumps recommend one, and some don't. On the mechanical pump, when the needle in the carb stops flow, the pump keeps running, but no more flow.  What about the electric? Would it do the same, or is the regulator needed?  

And by the way, SnoMan, thanks.  I don't know who you are, or what you do, but you are a life saver on here.  

You will need a pressure regulator. Most pumps come with a adjustable regulator built into them. Those simply bypass fuel in pump to limit pressure and so more flow is available on demand. Some better pumps and most external regulator (like on cars with FI these days) have a bypass regulator the has a return line to tank. The reason for this is that it keeps fuel cooler because it is not dead headed on internal bypass and reduces chance of vapor lock because fresh cooler fuel is always at regulator. I would suggest that you consider the later with bypass if your plumbing supports it. If you use a external bypass regulator, place it as close to carb as possible. Nice thing about bypass regulators is that they prime quickly when run out of fuel or if a air slug gets in line from low fuel.