So I am putting together a new motor onto my existing 727 / PTC 9" converter. With the block and tranny bolted together how much clearance should there be between the converter (fully seated onto the tranny pump) and the flexplate? I have read at another site that there should be 1/8 - 1/4" which would mean the vert will slide forward to meet the flexplate, and provide room for converter expansion so the crank thrust surface isn't worn out.

I think mine were less than 1/8" but still had a little gap. I will unbolt the vert and check it but what number am I looking for?