Log in and look up the specs for the engine you need.
http://www.classracerinfo.com/
All the approved Mopar small block rods seem the same, even for a 273. SIR isn't legal and is lighter than the 755g minimum anyway. But I think they weigh the rod, piston, rings & bearings as an assembly with the minimum weights added together.
Eagle H-beam is probably the most common. Can't one polish down OEM rods to save weight? Lighter 273/318 & the standard 318/340/360 rods?