I thought I was kidding about the FEA app, . . .but

http://www.intesym.com/mobile.php


You've got the issue well in hand but I'd probably still err on the side of fine thread. I noticed the bumper bracket bolts were fine threads, and a little LocTite never hurts.


'69 1/2T stepside, Sea Foam Green, 250 L6 w/ 3 on the tree, not an option on it, in the family since new.