Valve stem seal tool

What tool is used to change valve stem seals on a box stock 318 without removing the heads?

I have a regular valve spring compressor, and know which ones are use on a chevy, but what one is used on a shaft mounted mopar?

I bought a stone stock 78 power wagon with low miles from the original owner, but it blows a big blue smoke screen out the exhaust when it starts up cold after sitting overnight.