[cobrashoch]

Burgs - The motosports 10.3 deck block in my garage weighs 187 lbs. and it has not been cut on yet.

The D1VE block I used in my car was 208 lbs pre machine'd and I didn't weigh the block prior to final assy. Through boring,decking,and honing, you will normally loose + - about 20 lbs. In addition you can have a block lightened 15 or 20 lbs.(mayby more) at most high quality machine shops for a couple of hundred bucks normally. I didn't lighten my motor but if I was to fresh build it over I most likely would, and I would use a late fuel block, I think. The lightest 385 blocks out there are the late model fuel injection blocks that come in around 175 lbs bare.
My iron Cobra motor weighed in at 545 with the supercharger, sans accessorys. A buddie of mines almost identical FE in a Thunderbolt was about 45lbs less. (Genesis block)
RDI blocks($$$$$$) generally are used on Boss headed engines,
but in any rate are heavier that stock iron blocks due to extra webbing, and are much heavier yet on tall deck blocks due to increased webbing.
Bottom line---- On 385's, if you are running the the popular "B' style heads out there, a stock iron block is all you will most likely need. If you are running a large bore combo, possibly with "C" style heads, I would consider a aluminum block, but keep in mind there are light weight block options too. For cost considerations I would run a RDI block on a boss, PERIOD!
The short answer to this - on 385 10.3 deck blocks they ALL, repeat - ALL, weigh in at plus or minus about 30 lbs. of each other. And there is some stuff you can do to even help that. All tall deck blocks regardless of material used will outweigh any stock iron block, even a early DoVE-A heavy block.
I don't know if the Ford Motorsports aluminum blocks can even be bought right now. Last I heard, you will be put on backorder if you were to try to get one. You most likely will find someone on the 385 forum that has one for sale if you are serious, and want to find one. My aluminum block is not for sale.
BTW - Build for matching build, a FE engine will only be about 60lbs (plus or minnis a bit) lighter than a 385 build. That's not much in my mind, unless of couse you are using a Shelby block. Shelby blocks weigh in at about 100lbs bare. In addition most aluminum FE heads weigh a little less that most "B" 385 heads.
Sorry if I've stepped on anyone's toes but this is how it all looks to me, and believe me I've been down this road a while. Maybe this post belongs on CC's 460/ 429 forum because by in large only a sports car group really gives a hoop about what a engine weighs anyhow, when building cross competitive engines.
cobrashock