@slantsixdan: thanks for the very thorough explanation. At this point, I'm still in the "will it even run" proof of concept stage. All I know right now is the engine isn't seized. The gameplan was to order everything needed to get the car running and moving under its own steam in one shot and keep costs down (shipping and customs fees on every order are the real killer here), hence Rockauto. For 15 USD added to my order, I'll probably take a gamble on a Rockauto kit first and get a proper one from your recommended supplier if the car is a proven runner.
Sadly A body parts are far and few between in Belgium, no wrecking yards full of orphaned parts to be found. This car was given to me for free, the previous owner already deemed it an economical total loss and kicked the can down the road, hoping I'm the right kind of crazy to get it registered and driving again.