Hmm... I have to start with either a 218 or smaller... or with a ZSB from a Chrysler 60 when I get to work on the replica of the car pictured at the start of the thread.
Ray-
If you are starting with a 218, stroke it to a 230 with crank, rods, and flywheel from the 230 engine.
I did this with mine, I'm very pleased with the result. Click the link in my sig to read all about it, I've just updated the site with pics of the maiden voyage if you missed them elsewhere... I think building a little racer with one of these engines would be a gas. John Burke over on the P15-D24 site is just finishing up a Ford roadster with a MoPar flat six, looks really cool.
Here's a few of my fav's:
and John Burke's flatty powered funster:
