It doesn't help that I stated the wrong engine
The L33 is the code I meant to refer to. The aluminum blocked truck engine, which weights approx 85-100lbs lighter than the iron block (*Depending who's number you trust).
This would be in the neighborhood of 60lbs lighter than an aluminum headed sbf, and probably 125lbs or more lighter than an all iron small block-anything.
ballparking to say the least, but any way you do the math it comes out a bit lighter.