You are obviously excited, as well you should be - you are basically doing all of the work. Once complete you always feel much more pride in your vehicle when you spent the time (and $) working on it. Yes, you can pay someone to build an engine for you...but, if you have the time and the patience, the end, in this case, doesn't justify the means.
I bought my Corvette with 29K miles on the odometer - ran perfectly...really enjoyed the car. I spent an entire year striping it down to the frame and replacing/rebuilding/upgrading everything. Now I love it.
My Nissan - bought it to be a cheap daily driver (which it is). However, I've removed/checked/replaced (if needed) everything on the car (keeping it OEM). I enjoy driving it...I also clean the engine compartment and undercarriage with only a toothbrush, simple green, and paper towels :rolleyes but that really has nothing to do with this topic.
Bottom Line - Enjoy working on your car, don't get frustrated if problems pop up along the way...it's what gives you great stories to tell when finished - Example: "So I had the engine completely assembled, was hoisting it over the car to drop in, and wouldn't you know, I dropped the enire thing on the shock tower...bent everything!"
Have fun,Dave