alright i have a 283... block number is 3896944 , heads number is 814480 , crank number is 3876768 as for the rest of it rods, pistons.. ect i dont know anything else but the pistons just have 2 valve reliefs and the center is raised... not flat tops as of now i am putting on gm performance vortech heads, performer intake, and a voodoo cam specs on the cam are 262 duration and 468 lift 1400 - 5800 rpm im really just wondering what you guys think that it will do performance wise and how it will act on the street... btw.. the tranny is 700r4 and 4.10 gears in the back all under a 4200 lb. truck any input would be nice .. !! thanx