Looking for reviews on the LSX376/525

[Damn True]

Considering this engine for my project.

Wondering though if it pulls enough vacuum to support power brakes? Not sure if I'll run them but I want the option.

How radical is the idle?

Does it require a fairly open exhaust to be "happy" or will it be ok with an exhaust on the quieter end of the spectrum? I don't mind a bit of lope and rumble but I get along well with my neighbors and Id like that to remain the case.

Any low speed drivability issues?

From what I've read, it seems they benefit from a tune. Apparently many feel the GM controller is off to the rich side. Is this an issue with the early releases that has been rectified or is it still the case?

Thanks!