According to this article they're running a 4.125" bore and 4" stroke. You just can't do that on a 1980's 4bolt smallblock. .125" over means you're WAY into the water by then.

This guy in the article here says you can use an old 400 block if you got one, but that's a totally different block than an 80's 4bolt that homeboy got his hands on.

Now, too bad I didn't get a 400 block for free instead of this 4 bolt 350 I'm working with. I would've *SO* built a smallblock 427!