Most likely either the bushed or the needle bearing rocker arms will work, as the valve spring pressures the OP is going to use are not over the top using hydraulic lifters, even with the stainless 2.250" intake valve.
However, since the OP is going to use a 1.8:1 rocker arm ratio, this can increase the stress on the rocker arm over a 1.7:1 rocker arm ratio, depending not just on the seat and open pressures. Here it is also good to look at the spring rates at every 0.050" of compression.
Using a higher (numerically) Rocker Arm Ratio allows for a reduced lobe lift. This tends to reduce the load on the lobe, while increasing the load on the valve springs. This is why some increase the diameter of the lifter, as it spreads the load out over the larger surface of the lifter.
With higher ratio rocker arms, it is also good to understand that one is multiplying the spring values by the rocker arm ratio on the pushrod side of the cylinder head. So a stronger push rod is usually chosen here.
While I might not choose the needle bearing rocker (the OP might(?) if I did I sure would want the rocker arm (needle bearings) to be encapsulated.
Having needle bearings go everywhere in your engine, is what brought on the bushed lifter as well as the bushed rocker arms. . . .