I don't know the finer points of sizing a turbo to reduce lag or optimizing a specific rpm range but I have been around Leo's 292 drag car some and I know when he changed from NA engine to a turbo he changed the rear end to run lower rpms. By lower I mean you don't have to run 8K to make power. Also changed cam. Intercooled methanol injection, 10 something 130 mph quarter mile. He is hoping to improve on that. Check out
http://www.customdesignperformance.com/leo/leo.html