Help I did it again!

Well like many of you I have too many projects but again I make a mistake. I was looking for a car that I could drive from the day of purchase. I was told by the owner that he would even drive it half way to meet me! Or I could bring someone and drive it home. But I decided to take a friends trailer and go get it by myself. I had offers but it was over 4 hours one way. So when I get there the car will not run well. He claimed that he and his wife had it out for a ride just the day before. The slant six hardly had the power to pull itself up on the trailer. Yes I bought it, (another project now) because I drove all that way and he did lower the price by $400. He also claims the motor was rebuild just 5000 mile ago and he did have the paperwork. Here is my problem...when it is running it shakes all over and when you give it gas it just coughs. The fuel pump is working great. I replaced the fuel filter. I took the top off of the carter 2 barrel carb and it looked clean inside. I adjusted the timing and carb and have it idling a lot better but it still seems to have a miss. No particular cylinder just every cylinder pulling plug wires one at a time seems to make no difference. I replaced cap and rotor...still when you drive it and give it gas there is no power or response. What do I do? Here are some pics. Anyone have a /6 for sale?