I think I can scrape up a new signature quote if someone doesn't beat me to it.

This is in the "for in the what it's worth section" The only Olds motors I blew up were 425's. It was for alot of different reasons and I can't prove anything. It was over 25 years back but I do remember several of the pistons cracking and the were Bonolite .040 pistons. The car was a 66 Toro and was a total sleeper. I've had enough cars at the track to know it had low 14's maybe even a high 13 second potential. The power it had after 50 miles per hour was incredible. I had it going 133 MPH with 4 guys in it and it was still going strong. Either option a 425 or 455 is good in my opinion.