"1st stop" is often a compression test. This may tell just exactly what is "a rebuild".
'2nd' can B an evaluation of how the last several thousand mi or few yrs of driving (B4 the 'troubles' B gan) the vehicle were. What is sought out of the vehicle - it's faults'n good points. This is all due to the extensive wrk to rebuild, if motor is pulled mights well go over it well while out rather than put in just to pull again... Also if seeking "a lill more' or "alot more" a plan is needed to achieve 1 or the other.
So 3rd, this plan is kinda what you've presented us or at least the place U might B now. If the earlier parts (Q abt 'application' intended 4 this motor) are well done the answ almost falls out of that wrk.
BTW - several resources for this - most of us use the "Ford 6 Performance Handbook" (`$20 at a place that has prts needed retail - vintage inlines dot com). While ur doing more thinkin & research, waitin for delivery of Handbook U can peruse a 3rd resource @ above big blue box w/crossed screwdriver/wrench. Scroll dwn to General Info then onto "Mild Street Motor" if thats a build back to stock (not my recommendation. Modern times require modern engines. A very few, sm, inexpensive mods go a long way w/these hearty motors. They never get modern MPGs but can keep up w/todays traffic and be safer'n more performance oriented than 1965 easily). A modern cam, '77 + head, carb and ignition is all that's needed. That 200 can then push that lill heaver FLaine around way better. Just love the grill'n stacked hdlghts of the '66!
W E L C O M E !!!
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Enjoy yer stay.