904 converter to flex plate clearance

my question was more how close the converter mounting pad is to the flex plate before you pull converter out to bolt it up.
I had 1/8 inch between them
Stock is actually a little more than that, so it's not "too much" if that's what You're wondering. I've seen them without enough, & they wrecked the frt. pump because when they heated up & swelled(balooned) in action the hub slots side-loaded the pump gear.
Try tagging a member building trannys, I'm not sure what a safe racing minimum is, the reason for the "flex" plate to accommodate expansion. But if the crank-end hub of the converter bottom-seats in the crank, it has nowhere to expand but rearward towards the pump.