919speedychris

I am a new to building motors so bare with me. I have got a 67 383 with flat top pistons that is 30 over. It has been balanced. A cam came with the motor but I dont know what it is. I have some rebuilt 452 heads that have been lightly ported. I have a weiand 7511 manifold. A 750 Holley carb. Also I have a small BRE turbocharger for it. This motor is going into a heavy truck "76 4x4". MY question is how big should I go with a camshaft before I have clearance issues and powerbrake problems. Also how do I figure out what cam I have, It only has 1 bolt in the front. I saw that a lot of performance cams had 3 bolts. If the cam is stock can I just put 1.6 rockers on it to spruce it up a bit. Thanks.