Ticking

so after putting car on dyno in Bakersfield ca. Short story shorter. Floated valves at around 6200. 6400 rpm. Engine is 440. .30 over. Howards hydraulic roller.150 NX plate. 516 heads. At time on dyno it had isky adjustable rockers. Now has Harland sharps. The next day when I pulled car off trailer and drove it for about 3 miles. It started ticking by cylinder 8 or 6. Pretty sure its 8. None of the comp cams push rods are bent. All new Harland sharp rollers. Ferrea valves pretty fresh. I pulled top apart 3 times. It's not exhaust leak. All the lifters are fine. I even changed the lifters to the other bank and ticking is still there. I've done compression check. 8 and 6 are fine and don't leak down. Oil pressure is perfect. Don't really hear it until car just starts warming up which lead me to think lifter but they check out. It's in a 71 dart hence why I haven't pulled head yet so it's tight in there lol. Any ideas. Thank you