Id this odd engine noise. old problem time to solve it

[mtdave2]

http://s27.photobucket.com/albums/c1...ent=tap3-1.mp4

http://s27.photobucket.com/albums/c1...rrent=tap3.mp4

http://s27.photobucket.com/user/mtda..._0013.mp4.html (about 0:30 in you can hear it well.)


I have been so pissed at this truck, and busy with other things, I have not looked at fixing it several years. so I am not really remembering all the details, but I am going to fix it now. even if I have to swap the motor out.

Anyway, thought I would start and ask all the experts to give me their best guess on what this very odd sound is.

orgnial motor, made into a 383 by very good shop. ( i have lost the details of what was done. 400 crank is all i remember)
rockers
http://www.summitracing.com/parts/SUM-G6935-16/
heads
http://www.summitracing.com/parts/NAL-12558060/
cam/lifters
http://www.summitracing.com/parts/CCA-CL12-234-2/