Unfortunately as you have found there was no 454/700R4 combo offered from GM .

I had to make my own Hybrid BBC/700R4 calibration but I use a different PCM than you are using .

If I were you I would let Dave take care of a custom calibration for you , he has done a few things for me in the past , always exactly what was needed , and a super quick turn around time , you will have no problems .

TOM