65 Barracuda 318 Rebuild, Cam, timing, lifters maybe a kit?

My 2cents
forget cams
just add 10% , or more, rear gear,for Waaaay more performance increase.
Or better yet forget the cam and the gear and just put a 2800TC in there; now yer talking tirespin.

But if your lifters are worn out , well then, somebody said RV cam. I've never tried one, and never will. But I would try a solid lifter cam, with the same net advertised duration after lashing, that you have now, and with lightning ramps and as much lift as the grinder can provide, and install whatever springs he says to; Teeners with pistons as far down as yours are, just can't afford any pressure loss.
For the same reason, for your combo, I would get the cam ground on a much tighter LSA than the 112 stocker. Your current combo is probably a 904/2.76 gears which means 4800 will be about 54 mph, so it's basically a one gear car. So in this case the 112Lsa is nothing but L-A-Z-Y, and I would get rid of it.
But if you take my advice and put at least 3.23s in there, now 4800 will be 46mph, so it's still a one-gear powerhouse, cuz when it goes into second gear the Rs will drop to a tic over 2800, and it's game over.
So since you are going to the expense of adding headers, you might as well take advantage of them with a tighter Lsa to increase the overlap, and take advantage of that powerbulge it will make.
Ok so after all the talky, here is my recommendation;the stock cam is a 240/248/112 with overlap of 20 measly degrees which is why it idles dead smooth at 600rpm.The compression degrees are 132*, and extraction is 120*, for a total of 252*. Ok so we can sacrifice a ton of extraction and just a teensey bit of compression, more if you get the 2800. So the solid I am working on needs to maintain the 48* ICA as closely as possible to keep the cylinder pressure up. But I think we can double the overlap for a nice fat powerbulge somewhere around 4400/4800
Ok so I like this; 252/258/106 with overlap of 43*. In at 102 you get compression of 132 (loss of 0*) and extraction of 121*( gain of 1*) for a total of 253* These are net after lashing.
So lets gross them up by say 8degrees to allow for lash, and I get 260/266/106, and the closest cam you might find is; 262/268/110; Close enough BUT NOT ON A 110LSA. Get someone to cut you those on a 106.
Ok so if you do that, and allowing 8* for lashing I get a true net after lash of 254/260/106 with overlap of 45*, so it idles like a 340 cam (44*), and the Compression is still 132* and extraction of 119*, for a total of 251*, just a 1* loss from stock. The ICA comes to 48* just like stock, so your cylinder pressure will be just like stock. And if you keep the cruise rpm above say 2200, then it is apt to make hiway fuel mileage similar to stock. Of course around town it won't be nearly as good as it used to be lol.

But the truth is the above cam will do nothing much for you until the Rs get up.
If you have 2.76s and a 1750TC, that's gonna be a bit of a wait, like say 30 mph before it wakes up.
Whereas,adding 10% or more rear gear to what you have now, and using a factory cam, and a 2800TC, will far surpass your current take-off performance. Like instant tirespin.
And say 3.23s and that 2800TC will add the missing bottom end to the above described cam.
You just can't hardly beat the 2800, over the stocker, for a street 318.
And for icing on the cake, it's hard to beat 20% to 30% more gear over a 2.76.
Whatever you decide
Happy HotRodding