rb25det with 26 internals first start mapping

[tidi0x]

I am currently building my S2 25det from my R33 with a 26 crank, nitto I beams, and 26 CP pistons. 

I have a G4x PNP which I intend on using with a brand new loom from wiring specialties with r35 coils. However when it comes time to do first start since pulled the car down from bone stock I want to drop the built engine in the car as stock for first start because I know those parts WORK and I do not have to diagnose anything with new ecu, loom, turbo, intake etc.... 

I have no issue running the G4x on first start, but I do not know which base map to use be it the 25 or the 26 map, so my second option (And somewhat preferred) is the stock ecu, but I am concerned because the stroke is longer technically the ignition would be slightly retarted and I do not want to risk knock or detonation; Obviously I do not intend to beat on it, but I want to put light driving load accel and decel on the car to set the rings. After first start and drive, I will tear it down and run my turbo, intake mani, G4X and take it to my tuner to get the tune.  

Am I safe to run stock ecu for first run and drive?

Also can someone please validate that for a 25 with 26 internals I need to run 26 Main bearings.... I have found two threads that talk about it with no SOLID answer. 

[robbo_rb180]

use the 25 base map if a plugin as the inputs/outputs will be different but should always confirm all settings before first start. The Link ignition base map is fine for first start.

[GTSBoy]

It is an RB25. Definitely use a 25 map. The only thing that is "26" about it is the capacity, and capacity does not matter. The AFM will take care of telling the ECU how mush air it is breathing.

[NZ-GTT]

You can change the engine capacity in PC link. Go to: ECU Settings>Fuel>Fuel Setup>Fuel Main>Engine Capacity

[NZ-GTT]

I wouldn't bother with the stock ecu. Just install the Link and follow the setup instructions

[tidi0x]

Thanks guys, I'll be sure to use the link and the rb25 base map and change the capacity for first start.