I am looking into getting a motor build some time this year. My choices area 383 or 454. I want about 400hp & 400 ft of torque. I going to be running 14bolt, d60 and 40" tires. I want an engine that is capable of some serious tire spinning mud flinging power. The 454 is the choice for most people because of great torque & hp all the time. But taking budget into consideration I think the 383 would be cheaper to build and it it works almost equally. I also already have a 350 block & all the accessory's. For the 454 I would need everything. Anyway thanks for your input.