engine noise

I'll start with the build, 360 LA block, 308 heads, comp xe268 cam,273 adjustable rockers, kb pistons,rpm intake, 650 eddy carb. I have what sounds like a lifter noise that is much more audible under acceleration. I have adjusted the valves .030 past zero and rechecked them several times. I then put on new lifters, all new exhaust gaskets, pulled spark plug wires off one at a time and test drove it, nothing I have done seems to make any difference. This build has about 200 miles on it and has made this noise since the first time it was driven. I also checked the timing and retarded it just to make sure it wasn't detenation. I have 170 to 180 psi of compression and run 91 octane gas. Any suggestions will be greatly appreciated, i'm about ready to give up on this thing since i've been chasing this noise for over a year now! Thanks in advance.