So I've been doing some "research" recently about the 383 B that's standard in just about every C-body, but just about all I can find is how to swap it for a 440. I did find a couple stroker kits here (http://www.440source.com/strokerkits.htm) and the 438 kit caught my eye. There doesn't seem to be a lot as far as heads go either. Can you bolt on heads for a 440 or would that work with regular 383 intakes? Are the stock heads worth doing a port & polish? I'm mostly wondering about the fuselage years. The main question I can't seem to find an answer for is how much horsepower or how many RPMs is the limit for the factory block? I read somewhere that a stock 2 bolt main 440 starts to come apart around 6500 RPMs but couldn't find anything about the 383. In my mind the B engine seems like a good sleeper candidate since nobody expects anything from them. Most of them seem to get tossed in the backyard and forgotten. No, I don't have one, let alone a car to put it in, but I like to gather knowledge beforehand and since the 383 was standard most years, I'd really like to here y'alls opinions. BTW this whole train of thought was started by Stan saying the 383 2 barrel was his favorite C-body engine awhile ago. Thanks for any info/links in advance