how can ya tell??

The LA displacement is the last 3 digits of the casting number in the side of the block behind the starter. It will look something like XXXXXXX-360. The B/RB is a stamped number on a horizontal pad located on the driver's side at the juncture of the block and head. It sort of juts out from the front valley cover rail. If you are interested, the slant 6 displacement is stamped in the block deck at the right front corner (you have to pull the head). It will read XX225X VIN sequence number of vehicle. Those are the only sure places I know to look. Casting number decoding is iffy at best. Ma Mopar used the same castings for a lot of different things, and didn't always keep track of what went where this week. Hope this helps. :thumbup: