You said FTG kunai's are placed and that means Minato wins but since you said no seals then what we have seen of both, I being one of the biggest fan of Minato, chose 3rd barely...
Reasons:
what we have seen till now, Minato has only Rasengan and taijutsu for offence whereas 3rd has very strong nin-taijutsu for offence..
Minato's FTG tags are everywhere so its almost impossible to catch Minato now whereas 3rd's sheild will protect him from any damage caused by Minato..
From these facts, 3rd wins barely...
As a fan, Minato is super genius, if Naruto can find his weakness even with the help of Hachibi, Minato alone can but IMO he won't be able to do like SM Naruto did but he can find another way, with this Minato wins barely...
No offence........