If you like a big block, get a 1958-1959 332 or 352 Police Interceptor. They had NO smog equipment and just a metal tube out the back that pointed down for fumes to come out of. I prefer to put on the PCV valve and hose from
oil cap to air cleaner as that removes pressure better. These engines are had to find except in restored cars, but there isn't much they can do with a pre 1960 engine as they don't even have any smog rules for them.
Ron