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You MAY have to drill out the mounting points at the back of the gearbox space, for the small GB cross-member. Might be worth plating the mounting points too if you plan anything serious with the car such as rallying.
You will also want to transfer the Dolomite steering column as well as the heater controls and so on; the Dolomite column will (a.) align properly to the mounts on the fascia, and (b.) carry the switchgear for lights, wipers etc. You will probably also want the 2-speed wiper motor.
My December 73 model Toledo already has the holes drilled for the gearbox crossmember, I used them for my own fabricated one for the Omega gearbox I used! Earlier cars may not be so blessed!
It also has a 2 speed wiper motor that is not fitted to earlier cars, I caught a crab here with my conversion as I saved the Sprint motor from my donor car, intending to use it (so the plugs would match the Sprint loom) only to find that the hole spacing for the motor in the mounting plate in the bulkhead were different! And of course, i'd already junked the mounting plate with the donor shell!
I managed to fit a Sprint column to a flat dash crashpad with the simple addition of 2x 1/2" spacers between the column bracket and the crash pad plus longer bolts, don't think it would be do-able the other way round though so yes, a Sprint column would be needed with a curved dash (let alone for having somewhere to put all the switches)
On the suspension front, I run only stock Sprint front springs (140lb?) and the original stock Toledo springs (poundage unknown but VERY soft) on the rear, to go with my ASP and adjustable Gaz coilovers. I tried it on stock Sprint rear springs and it was so hard it just hopped round corners, especially on anything less than perfectly smooth tarmac (something there is a total dearth of in my neighbourhood)
I can't pretend that my results have any bearing on how a Sprint powered car would or should be set up though, as my Vauxhall engine/ trans setup is more than 40kg lighter than the Sprint equivalent and 4" further back to boot! But I find the more compliant ride both more comfortable (must be getting old) and more balanced!
Steve