Rick,
First congratulations an getting your cobra. And as for advise, unless you have already did so you will most likely get more in the All cobra Talk forum or the Builders Forum as a lot of those guys are going through what you will be and can offer some time saving and good advise. Have fun with the build and enjoy the Cobra. And for piece of mind try to stay out of the big block/small block discussions. Build the car for what you want to use it for and if yo want a big block put one in it. If it is to be a cruiser and show car, you won't need some of the beefier parts that you will if you plan to race it.
Ron