Diesel Demon

That's an 1,120 lb engine, dry. That's 300 lbs heavier than a Gen II 426 hemi. Even with the front suspension upgrades you have planned the sheer physics of the thing is going to make handling less than ideal. Guys run 1.20" bars with small blocks for road race and autoX applications. I run 1.12" bars on the street with a small block, and they're not anywhere near too big. And thats with almost half the engine weight up front. I think you're going to need to do more to that QA1 K and suspension components if you want them to live longterm. Not trying to be negative or anything, I have the QA1 LCA's on my Duster. But after seeing how the old CAP ones failed (bad welding), I gusseted my brand new QA1's even for my car. Probably overkill for me, but with the kind of weight you'll have up front I'd be looking to gusset the K and control arms further. Do you have additional chassis stiffening planned beyond just the subframes and crossmember? I would think you would need additional chassis work up front for all that additional weight.

If you're interested, here's the work I did on my QA1 LCA's, as well as some pictures of the failure on my CAP LCA's (QA1 bought CAP, the design of the LCA's is the same, but the production is much better).
My "new" '74 Duster- or why I need a project like a hole in the head

It also looks like it will be a dramatic reduction in ground clearance, based on the pan and how low the transmission mount appears. Maybe that's just the angle of the picture, but what are your plans for ride height?

Your fabrication work looks great, and I definitely appreciate the skill it takes to get as far as you have. Not sure I understand this one at all though, the size and weight of the thing is going to make life difficult at every turn. Literally and figuratively. Still I'm looking forward to seeing the finished product!