Congratulations to your purchase !!
Surely you have enough to do now for "long winter evenings"
As for the engine, just some radom thoughts (it´s not really my area of expertise),
as others pointed out, how about a Zytek V8 which was built and run in A1GP, I think, it would be the closesed you can get to a "modern" V8 F1 engine.
I´m sure Ferrari has taken their engines back (last years A1GP), after A1GP folded, but maybe they would sell one, as they will not have much use for them now.
two other idea´s which come to mind, an older Zytek F3000 engine, there should be plenty out there, reliable and "cheap?".
Or maybe worth to make a call to Cosworth an ask about the engine designed to be used in the Lotus Exos 125 "track car".
But I have no idea, what the price for such a engine would be.
For now, I think the gearbox will be the "biggest project" on your list, as you would need a gear cluster which fit´s into the original gearbox casting/housing.
Later, when you come down to the dampers and you have problems, feel free to PM me, I maybe able to help you, or at least get you in contact with some people who may can.
I´m not sure a MC damper will get you, where you want to go.
But compare with anything else, dampers will be your smallest problem.
I agree, that it would be good, to make a drawing or jig from the wishbones, as it is possible/likely
, that at one point you will break one of them. (don´t hope so, but if you plan to run/race the car, it can/will happen at one point).
It will be a great challenge to reproduce them in titan/carbon fibre, if you have no support from Brawn/MGP, but a good fabricator will be able to produce a steel one with the same dimensions.
If you plan to race the car, this is maybe the better/safer option (steel wishbone/pushrod) to start with.
As the constant checking (NDT) of the carbon parts will be either expensive, or out of reach to do yourself for an amateur (no disrespect), due to lack of equipment and expertise in NDT for composites.
Keep in mind that most/all F1 parts are designed with a very short lifespan in mind.
All parts will normally run to a very strict lifing/milage shedule, and will most likely "break" due to fatique, when "their time is up".
It maybe was cheap to buy such a car, but running it, will be a different matter, as these cars are very service/care intense, and not your standard turn key amateur race/track car, which will run "forever" as long as you put fuel in it.
Good luck on your way & all the best.