Anyone use Lunati 73100 springs on a big block?

I was thinking about switching to the recommended Lunati springs. I currently have Mopar Performance springs but the seat and open pressures aren't as high.
Are Lunati's a good spring?

http://cgi.ebay.com/ebaymotors/16-New-Lu...rts_Accessories

The cam is an old grind... SPG2-322 PN40316