http://www.lcengineering.com/LCInstructions/1015012_timing_chain_conversion.pdf
That should be accurate for a 20R since that's a dual row timing chain conversion kit. lists all the bolt lengths
I'm not exactly following you....are you saying that the conversion makes it like a 20R and then we can reference the bolts listed here. It does seem correct if I'm following you. The old was was slightly shorter (about 5mm based on my 90mm purchase at Ace and your the referenced 85mm from LC).
Anyhoo, I just bit the bullet an ordered a new radiator and cap. $160 delivered.....oh well, hopefully I can catch most of that new coolant and recycle that.
I don't know if the radiator tanks are plastic or not.
https://www.rockauto.com/en/moreinfo.php?pk=272152&cc=1277120&jsn=367Sit back and watch me spend my money on the goose chase, folks.