2000 C70 engine code 56 (B5254T) with blown head gasket (bought it that way.) Had been under the impression that switching to anything else was difficult, but reading a few of the threads here indicates that may not be true. Seems some here prefer the 2.3 etc, one of which I've found. Sometimes the Volvo enthusiast-specific acronyms blow over my head, and haven't found explanation for a few.

What's possible to put in here with a reasonable amount of effort? Are 2.3, 2.4 and 2.5 largely able to swap parts, like injectors/manifolds etc across them? What is a B5254T2 vs the T? Will they exchange? Match the ECU to the car, as long as you can move pumps/injectors etc across? Don't mind playing around a bit, but really don't want to develop a garage queen project chasing quirks all summer.

Thanks, John