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thank you for the replies and the link, I am deff gonna go ahead and do the 411 swap asap.

I have intentions of putting the 67mm turbo I have layin around on it and testing out the bottom end strength one of these days. So what your saying is, there are no COS for the black box ecus huh....

Now that your able to tune the black box ecus is it worth it to put a 411 ecu in my truck? Also does anyone know what would need tweaking if I was to start with a 5.7 base cal to run my 305?

hello fellas, I am looking for a base cal for my 98 c1500 with a 305 vortec and a manual transmission.