Good luck finding +.080 cast pistons. After months of looking I was able to come up with four +.080 and two +.120 pistons.
I had the two +.120 machined down to +.080. And even the four +.080's that I did find needed to be machined to fit.
If I had it to do over I think I would put sleeves in all 6 cyl.'s and go with std. bore size, or +.030 over, these are some what easer to find than the +.080 cast pistons.
Egge list the +.080 pistons but didn't have them.
The machine shop that I had do the work had no problem finding my +.080 rings.