Looking to replace my 273 with a 318, which one?

Hi all! Please forgive me if this is a goofy question, I'm a complete newb to mopars and am not sure how to phrase what I'm wanting to know exactly. I want to replace the stock 273 in my 65' Barracuda with a 318. I was thinking of ordering a stock 318 crate engine from the dealer. This car doesn't have to burn up the track or anything, I just want this one to be a cruiser. What year should I order the 318 for when I'm talking to the dealer? (I want it to be carbed and use a mechanical fuel pump). Will my 65' exhaust manifolds bolt up to a 318? I saw a thread on here covering this earlier but now I can't seem to find it through search. Any info is appreciated, thanks!