No replacement for displacement - really???

[gearbanger]

If I ws starting from scratch with a Chevy, I would not even consider another engine than an LS based combo. That being said, I would build a large cube engine regardless, because I think it is smart to start with the most cubes you can. It will require less boost to reach your target and the engine will have more torque while not in boost. I am not that knowledgable about boost, but from what I do know, I wouldn't do a long stroke engine with much boost because of increased dwell at TDC causing potential for detonation. For a street car that will sit in traffic and heat soak, you need to always keep detonation resistance in mind. So, if you go BBC, I'd probably stick with the 502 or something like that to keep the bore>stroke and the stroke not so huge.