Unfortunately, OOB is not gonna cut it. I would buy the Tamiya M2A2 E sprue and use it on the Meng M3A3 kit w/out any of the ERA blocks. You can leave the BC’s armored glass surround on the turret as they have been retained on some Bradleys.
If you want the most up to date, you need the T161 tracks out of either Panda’s M109A7 or to get the original Kinetic M3A3 kit (#K61014), which has the smooth side skirts already, but some other things to correct, the light mounts as above for one. More info on how to make it w/out the BUSK can be found at the build review I did of the original Orochi M3A3 (kit it is based on) without BUSK.
This covers most of it though.
Lots more Bradley info here: