the noise is driving me crazy

[Square84]

ok i am in need of help bad my truck is drivin me nuts. a while back the truck started making this weird ticking noise. everyone that listened to it said the same thing the flywheel is cracked. even had a transmission shop tell me it sounded like the flywheel was cracked. ok so like the anal retentive person that i am i decide to pull the truck apart and fix everything. replaced the flywheel and put all new seals in the tranny and new fluid and filter. pulled the motor repaced timing chain, harmonic balancer, all seals and gaskets, new oil pump, new distributer(accel), all new vacuum lines, new brake check valve and filter, new fuel lines, fuel filter, put a k&n air filter, and new pcv valve. also replaced to bent pushrods and the rocker arms for those pushrods. put new header gaskets on checked and double checked the gaskets. the collecters have been welded to the pipes. the noise is still there it only does it under mild to heavy acceleration and it sounds like when you shake the pcv valve only louder? i use mid grade gas and am running an edelbrock 600cfm carb. ther is no smog on the truck and it is a 305. so if any one has any ideas please im open to them all? sorry so long.