Thanks that is very helpful. Maybe I will look for a 400 block, instead of boring this one any bigger, keep it a 406.

Another option I have is to build a 350, I have 3 blocks to work with, all stock 4 bolt cast#3970010. With my heads, intake and carb any ideas for a good combo to make some big power. I checked Ryan's page and only one combo made good power with anything close to what I have, combo #26.

http://www.ryanscarpage.50megs.com/combos4.html

What do you guys think? I would like 400HP and about the same torque. It would save me some money if I can use some of the pieces I already have.

Thanks