The late model smog motor timing setup was introduced post 1971 (I think71/72) to meet new pollution standards. The easiest way was to detune with a + or - timing set up. Therefore the easiest way to make a BB breath is with the pre- 70 setup. That is my understanding and it has borne itself out in the Dr. Jeckyl, Mr. Hyde change in performance in my 351m and two 460's. After that, a nice of Dove heads, headers, rv cam and it will keep pullin' long after your hands start to sweat.

4.10 gears help too. I don't even want to think of what highway gears would be like. For me 4.10's act like a foot governor

I'm concerned with what that change, to straight up 0 degrees will do to all the computer stuff(can it adjust?) injectors(which I know little about) etc. etc.

I'm sure somebody has done it, somewhere. Its an old, old therom of 460dom