I have looked all over and maybe we can find a answer to this question and sticky this thread.
Im specifically trying to find the tension bolt torque specs for the 20b engine as well as torque sequence.

 

Almost all the 20b torque specs are the same as the 13b-rew, was for the sequence. since the rear two housings have be assembled prior to the front.
It would be fair to run with the 13b sequence, then add the front housing and continue. you could also go with the train of thought that you do up the rear to 2/3rds the spec and then do the same once assembled the front and final sequence to full torque .

 

If your using the stock 20B through bolts then I'd torque the bolts as mentioned to 2/3 until
you get the front housing on. Then fully torque as per 13B (remembering to do corresponding front bolts) This is how I did mine.

 

Mazda has a training and service manual for the cosmo, but the section where the engine gets rebuilt is not in either book. nor are the part numbers in the parts catalog. in short you can't find them because there aren't any

 

Have you checked the Tech Data in the manual? starting at page 545?