You do NOT need this:
http://www.summitracing.com/parts/hly-20-2
If you buy the rest of what you have listed.
You do need to have new intake manifold gaskets:
http://www.summitracing.com/parts/edl-7265
These do not show the "end" pieces, so you will have to lay a 1/4 inch thick bead of RTV to seal the front and rear of the intake manifold.
This may be a better fuel feed line, as it includes a "barb" that you can connect rubber fuel line to.
http://www.summitracing.com/parts/mrg-1558/overview/
I believe you can do the job your self! If you have a basic socket set, it isn't too bad. A torque wrench would help ensure you don't over tighten the bolts when you reinstall the intake manifold.
The cast iron intake is heavy, and well sealed to the heads! After you have the intake manifold bolts out, the intake may not want to come off, don't let that bother you. Use a pry tool as necessary. Just make sure you have all the bolts out.
A vacuum gauge is very handy to tune the engine when you get it back together. You may need to make a slight adjustment to your timing, to take the best advantage of your new carb and intake.
Also, if you don't know how old the timing gear set is, you should replace it. They stretch over time, and cause LOTS of hard to identify idle and performance issues.
If you are going to replace the carb and intake manifold, now would be a really good time to do it.
http://www.summitracing.com/parts/clo-9-1121/overview/make/ford
This set has the end pieces, for the intake set.
http://www.summitracing.com/parts/fel-1240
http://www.summitracing.com/parts/fel-2710
How to tune: