LA360 compression

Compression distance
Kb107=1.675
Silvolite1273=1.576
.099 difference.
Learn to assemble your own engines and this will never be a problem again. I’d buy a set of rods with floating pins, a set of kb107s, and a ball hone and go to work. That’s assuming the bores measure ok and Mabbco’s machine work is ok, Which is questionable. You could be up and running in a weekend.