"The 528 engine has aluminum heads, w/p, intake, etc. along with the fiberglass hood & front bumper, aluminum brackets, Viper calipers and chromoly UCA's & LCA's. I would think it could compare to an iron 340 and stock front components IMO

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I don't know about that.

The aftermarket blocks have been running quite a bit heavier than the originals. Even with the aluminum pieces you mentioned, it is tough to get a Hemi down to the weight of a big block, let alone a small block. Everything about these elephants is big and HEAVY.

When you get it together and have a chance to weigh it, let us know.