OK, Here's my suggestions:
1.) Find a stock 302 engine (date code really doesn't matter, cause no one's ever going to see it anyway)(bear in mind the only basic difference between a 289 & 302 is the crankshaft - longer stroke)
2.) Install an Edelbrock 4V intake & carb. (Grind off the Edelbrock raised letters prior to painting the intake the correct Ford Blue.)
3.) Stock or MILD cam - your choice.
4.) Pertronics solid state ignition in the distributor.
5.) Install the engine dress up kit, with a 289 emblem on the air cleaner.
6.) VOILA: You now have a stock appearing engine installation that will perform beyond your needs, and you'll be the only one that knows the difference between #'s matching or not.
7.) Optional: Hi-Po exhaust manifolds (NOT HEADERS) & dual exhaust. (This will be obvious to the educated observer, and 289's didn't come with dual exhaust.) If you opt for dual exhaust, for Heaven's sake, also install the GT rear valance. Again, not factory correct but looks soooo much better. Also, the repro valances don't fit worth a damn, so be prepared to spend some $$$ with a body shop to make it fit decently.
8.) Optional: A .325 gear ratio for the rear end. Your car probably has a .273 ratio. A .325 will scorch the rear tires if you wish that kind of performance, but will diminsh fuel economy.
As far as the engine: KISS= Keep It Simple Stock. Don't waste a ton of money unless you plan on doing some speed competition with your car. Engine modifications seldom pay back the investment.
My 2 cents worth.
Neil Hoppe
P.S. DON"T PAY ANY ATTENTION TO ROB or JOE.
THEY ARE BAD BOYS!!