The costs are about the same regardless of platform. I've done the math, created spreadsheets and even built a few of them.

Al is cheating and using used parts. He also broke the block in his dragster so there is that to consider. I haven't heard of any G3's splitting blocks at those power levels.

While you might be able to save some money on using a stock crank in a 440, you're going to save money using factory G3 heads over the Indy varieties mentioned above that are >$3K new.

It's a balancing act, I continue to take the stance though that it doesn't matter, you're going to end up spending the same money give or take a few bucks.