Lifter rattle at start up

With 100 thou longer chevy valves I would be worried about the rocker arm geometry and rocker arm valve sweep! I had a pair of heads done like this and messaged mike from B3 engineering in the states for a correction kit. He said his correction kit for those valves would not even fit under the rocker cover and if the geometry was not corrected the valve train would be very unstable at revs and could lead to rocker, pushrod and or valve failure. I spent six thousand on these heads only to put them under my bench and purchased a set of trick flow heads from B3 engineering and have never looked back, producing over 40 more HP on my 410 stroker than with my edelbrock heads and now revs cleanly to 6500.