318 Bored .60 over...possible overheating?

My friend and I were placing the new radiator in my 68' Valiant for the new 318 I am putting in there and he asked about possible overheating issues with the engine being bored .60 over. I went online to research it a little and of course I am getting the "it will be fine forget about it"..."Oh my Gosh, you're going to overheat instantly" wish wash of answers. I decided instead of googling it and relying on a ratio of different answers I would post here about it in hopes that it would get me a little better answers.

Like I said in the title the engine is a 318 bored .60 over and I need to know if the stock cooling set up with a new radiator specified from a 1970 Plymouth Satellite with a 318 and a flex fan is going to be enough for keeping the engine at a decent temperature?

I am wanting the car to be a gas guzzling, noisy, daily driven grocery getter and I am hoping I wont be having to deal with temperature issues!

EDIT: I live if Northwest Florida...and the Summers get to be around 100 degrees sometimes...

Thanks,
Varment