383 engine noise

Hey guys I have a 1968 barracuda 383s 4 speed that has a little tick in the engine, when I first start it up you can hardly hear it but after the engine is warmed up it is noticeable. You can hear it at idle and as you slowly bring the rpm up the tick speeds up. My buddies say I am being to picky but it's a rebuild engine and it's bothering me. At idle the oil pressure is 50 psi at cold and 25 psi when engine is warm. I am running 15 40 Rotella and mobile 1 oil filter. The engine is basically stock, 906 rebuilt heads, stock exhaust manifolds (with gaskets) 68 RR cam and MP hyd lifters, new std volume oil pump, new stock iron rockers ( original shafts) new 383 push rods, fresh bottom end with KB 400 .30 pistons. Proform electric ignition with orange box. I am leaning towards lifter tick or exhaust leak. I am hoping to upload a sound bite when I find out how... If I am missing any info let me know. Any help where to go from here would be appreciated. Thanks