Coil Over vs Torsion Bar

Great read! If it's okay, I wouldn't mind a few opinions. Here's my preference for my car. Street, handling, cornering, all around abusing. No long tours. It is a 69 dart with manual brakes and manual steering.
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Option 1 - I was about to commit to a whole FirmFeel set up (heavy front torsion bars for lowing and stiffness, tubular uca, etc, strut rods, new rear leafs, sway bars front and back, shocks all around, and all the stiffening kits for lca and k frame) - This would allow me to keep previously purchased disc brake conversion kit (already installed) and it would cost me pretty much $5000 CAD even (with taxes and shipping to Ontario). This did not account for any new steering components, which is probably needed. I could sell some stock parts(new in 2018 with the conversion) uca with big ball joint, and be left with used torsion bars and that's about it.
Benefits:
Front and rear are done, very few parts left over to sell.
Negatives:
I still have to do steering.

Option 2 - Just as I get the finalized quote, a local person puts up for sale, a never installed HDK k-frame kit, rack and pinion steering complete with Willwood brakes, drop spindles, qa1 coilovers, sway bar etc. There is nothing for the rear suspension. Listed for 5900 CAD. Depending on flexibility that price could be negotiable. For arguments sake, let's say I was able to get it for 5000 -5200 CAD - I don't know yet. He bought it a few years ago, never installed it.
Benefits:
Steering and front is done. I'd have a front end disc brake conversion to sell, so some recoup there. (UCA with big balljoint, Discs, spindles, LCA, v8 k frame)
Negatives:
The rear end hasn't been touched. Needs leafs, shackles, sway bar, shocks etc. I will guess (fairly accurate) at rear costing me 1200-1500 CAD for that. I can maybe get 500-1000 CAD for front end parts left over?
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