I prefer the mechanical and the small block chrysler fuel pump is on an offset ring, bolted to the front of the cam. Electric is great, but will need a regulator or too much pressure will weaken the needle and seat. Or just over ride it due to too much pressure. I believe Holly still makes a great 6-8 pounds of pressure mechnical pump that I use along with a regulator. Good thing about the electrical pump is you can adjust the regulator. You can adjust the reg on the mechanical one also but you have less pressure to work with.