I live in Sunnyvale so you are quite a ways from me.
Do yourself a big favor and stay with a complete stock ford system. Most will agree it is the way to go. But the best thing about it is that you can buy anything over the counter. May not be a big deal for a trailered off road rig but it is nice to be able to walk into a parts store 400 miles from home and get what you need, rather than waiting on the aftermarket supplier to ship it to you.
If you are going to stay with a basically stock 302 you have a lot of cheap options. You can get a SD system from an 87 or 88. THey are not as highly sought after. I got mine of ebay for $90 complete with harness, sensors, and two computers. One standard and one auto. A stock 320 will not out breath these components. No need to upgrade throttle body, runners, injectors anything. It is by far the cheapest easiest route.
If you are going to hop up the 302 you will want to go to a MAF system 89-93mustang, It is possible to reprogram some of the SD computers but the MAF will be cheaper and easier in the long run.
I installed a SD system on my basically stock 71 302. It has shorty headers, super single exhaust, RV cam, and a K&N filter stuck right on the throttle body. Runs really nice set up like this. Even better if I bump up the timing and use premimum fuel.
My job,travel schedule and my own projects just don't allow me to help much but you are more than welcome to come on by the house sometime and look at my installation, and even drive it if you want. I even have some SD wiring diagrams that I altered for the installation withy colors and everything correct for the 87 system. I also have also installed all of te resistors to eliminate the check engine lights for pollution equipment and that tell the computer the EGR valve is closed.
PM me if you want to come by, we will set up a time. If you can read a wiring diagram you can do this by yourself. The ford SD sytem is one of the easiest of all manufacturers to retrofit to an old engine. It does not need a VSS or knock sensor. Wiring is very simple once you take everything you do not need out of the harness.