Building the 318/390 stroker

The Action Plus might actually hold you back a little bit with the enlarged displacement...even getting it ported may not be enough to match up to the breathing requirements of a 390" engine. You have to keep in mind, you're essentially building a big block displacement engine in a small block package...good breathing is imperative.

EDIT: you may actually want to wait a couple days for some more seasoned folks to come on here and recommend other cams...with the longer stroke, you really have to be more discriminating with cams...they eat up lots of duration.