Hello John and welcome!
The D24 block is supposed to be a softer alloy because of a lower nickle content, though i don't know how much a problem it is for strength, probably more of a cylinder wear issue. The crank and rods are the same, and yes it doesn't have oil squirters but if your not pushing 20lbs of boost drag racing the thing I wouldn't worry about it. When adding a turbo, you will want to add an intercooler and a oil cooler. Try messaging either George (v8volvo) or Kevin (slobodan) on here. They both have lots of engines/used parts and may have an exhaust manifold to spare. Your intake manifold is already great for turbocharing as it has the big snout out front to plumb your tubing into thats comming from the intercooler your going to install! You can probably also find yourself a used stock turbo if your wanting to go that route. Between the turbo, intercooler, and some pump tuning you should be well over 100 reliable hp assuming your engine is in good shape.
Jason
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