The small block Chevy is not that easy to install, specially not if the car is an originally 4 banger. Lengthwise it is just enough space for the V8. Using a 6 sylinder front, or modifying the 4 sylinder front will help, but it is still a tight fit. The distributior in the back of the engine is a pain in the butt, and the front, frame crossmember is very close to the harmonic balancer. I have done this swap for my car, so I know it will work, but many hours was spent on finding good, working solutions. A few things to consider: New radiator, limited space under floor for a TH 350, heating problems inside engine compartment, transfer case will need to be relocated.
The very same car was earlier equipped with a V6 engine. A lot more easy to install! And, if the Buick odd fire V6 is installed, this is nearly an original engine (sort of).
I would recommend a V6 or even an inline 6, but the sound of a V8 is also something to take into account....