Yes i know about the 400 b Block, and the reason of been in the 450 at low boost levels is the option to be at about 700+ whp if needed but i dont think i'll be in that range or better said i wont risk to be in that power level with the 383 block untill i score a good 400 block to test the 383 capability, in the Dyno and then the track, but not looking to have a race car only, i am planning to do it using E-85 fuel too cuz it is a gas station next to me that always carry it!
Anyway i am going to follow the 300 to 400 HP range at low to no boost you sudgest and then going from there.
I am still looking to find some good source of turbo cam for my needs thats the priority right now!
