Rebuilding a 65 273..I need some help.

that 273 at .060 over, is now a 283.6, rounds to 284/ 4.65liters.
The bore is 3.69. I don't think you can put a 2.02 in that hole, at any desirable lift.
A big-valve head is better-called a big-port head, which comes with either 2.02s or 1.88s .
IMO, and that's all it is; I'd rather use an intake valve that doesn't get shrouded at a higher lift, than a shrouded big valve at a more normal lift. With the advent of 1.6 arms, it's easy to get up over .500 lift.
But I also can't see a good reason to run big-port heads on your 284, for your street application.
-----------------
I forget the distance between the valve centers but 1.6 +1.88 is already 3.48 which doesn't leave much room on the bore centers . Allowing say .10 between the valves, is now 3.58. From 3.69 this leaves just .055 to each of the cylinder walls..... if the chamber is centered. If. Good luck getting all 4 of them centered.
If the valves do not open on the center-line of the bore you got problems.
Would I try it?
I plead the Fifth.