Hi zbeast, Thank you for the info ...Oh, I guess I forgot to mention that when the builder said that I would be ok he DIDN'T know of my intensions to add an 8:71!!! I plan on going by his shop in the near future and running my ideas by him. May be he'll suggest changing some 'other' items. Humm, not sure about the skirt on the pistons. Its got Flat Top Forged pistons {J & E, I believe?}, stock but shot piened rods {the 5.56 long ones}, a stock cast crank. I would imagine that I'll have to run low boost pressure. I'm thinking I'll put the 8:71 on & if it works good, well GREAT. If it doesn't then I'll built another motor with like a dart block & a bullet proof bottem end. So its not like the blower will go to waist or anything. One of the magazines did a build up on a 450 cu in small block with a dart block a while back and it caught my eye. So if the set up I have doesn't work may be I'll also let the dart block catch my wallet??? Thanks again, Bill.....