replacing intake manifold at moment, have a quick question

hey guys, i'm doing the intake manifold on my 00 GT. I found coolant in the spark plug wells and ive been missing coolant myseriously for months now.

Anyway. i have the old one off, i'm waiting for my gasket to arrive at the store so i can go pick it up, but i have a quick question:

do i have to use RTV or silicone or something like that near the thermostat housing? I thought i heard that somewhere but the diy from this site i'm following doesnt show that.. i dont want to do this over again!

I'm using the Ford racing o.e replacement if that matters

Awesome, thanks for the info. I should be done with the install early tomorrow afternoon as it got late today since i had to wait for gaskets to arrive from autozone

Alright, just finished up the swap. The car revs so much happier now.
I havent had a chance to drive it, i still have to modify the alternator bracket and i think i have like a lot of coolant in my oil from the swap because i am getting some crazy white smoke.
The spark plug wells for full of coolant..i couldnt figure out a way to get it out.. i just popped the plug open and let alll the coolant fall in the engine. ALL the plug wells on bank 2 were full to the top with coolant. I cant believe the car ran fine during all that. she's a trooper!

will report back with pics and after installation report in a few hours.
Thank you everyone for all the help!