340 cam timing, 1.6 rockers?

I once used a Comp solid 296S, 248*@050 w/.525 lift. Stupidly installed in on the 4* (IIRC) advanced key way on the crank. When I disassembled the top end, the valves were super close that it didn’t allow carbon to build up on the piston.

I retweaked the timing, later on another disassemble the carbon equally coated the piston top. Which I had pictures for this thread.