From your pics, it looks like a 292 exhaust manifold has plenty of room to fit an up-pipe to a turbo.
Snowman put a 292 manifold on a (IIRC) 68 Buick Special "A" body & his has less space.
People think the choke plate limits airflow ,so they remove it & in warm weather country, most do not need a choke if you let the engine warm up for a bit before moving.
Problem sometimes w/used carbs, the throttle shaft has a lot of play & when blowing through one w/shaft plays, it can make a mess with fuel comming out of the shafts.
I would run the turbo closer to the radiator support or at least even with the front of your engine.
MBHD
