396 build up and 12's possible?

[steelsixpack101]

A long time ago I purchased a 396 block from a buddy of mine. I had a machine shop bore it out .060 and align hone and surface the deck. I'm using 781 open chamber heads to let it breathe a bit. The heads had .065 taken off the deck surface. My compression is supposebley 10.8:1. The heads are being ported to flow about 300 CFM and also a 3 angle valve job. The cam i'm using is a lunati mechanical here the specs: In:.552 Ex:552 of lift-108 deg of lobe sep. -INO 12,
INC 40, EXO 48, EXC 4, the duration is 232in and 232exh these specs are at .050. The intake is going to a Weiand Stleath dual plane. The carb is going to be a holley 750 vacuum secondaries. The headers are hooker 1 7/8. I'm running stock lenght connecting rods(6.135). The rockers are also stock 1.70. The engine probably will go into a truck that weights around 4500lbs. The truck has TH350 with 4.56:1 gears with 32inch tall tires. A lot of my friends tell me my motor will make around 450HP 475lbs torque, how much power and torque do you guys think it will make? and also do you think a truck with the motor will run 12's with good traction?