Its M14 Metric fine so M14x1.5x35, from memory its a 10.9 so you're good up to 220nm beleive it or not, so 190 with a collared bolt doesnt sound unreasonable.
Its only 140lbs ft if that sounds more like it!!
If you've got a bit of time then renew the bolts, they 10.9 class so not stretch bolts in the true sense but you dont want to be swinging off them more than twice.
I think they're N90948802 prob cost you a fiver for all four