Come to think of it, I remember seeing something in the past
about the 1966 big blocks. I believe some 360hp 396 engines
used 4-bolt blocks in some cases and GM sent a service bulletin
to dealers alerting them to the fact that the piston domes
were different and that care should be taken when replacing
the short block assemblies as the SHP pistons would interfere
with the oval port top ends.
Anybody remember this? It may have been in Colvin's books.
