Edelbrock heads on a 340 with KB243 pistons

MOPAROFFICIAL said
.040 is huge and any bigger and there is no quench to benefit.

I have read anything above .050.
I liked the "Cometic" post! I have them do me up a custom set.
I have run a quench as close as .028. There were signed that there was rod stretch and the slug was getting to close.
Current quench is .038.