Stuck lifter, can replace just one???

I have a 1973 stock 318 in my 1967 Barracuda that I purchased to replace the worn out 273. I never heard the engine run but for $400 it was worth it to me to give it a go.

The engine is running except the #6 cylinder hydraulic lifter sticks and creates a clattering valve train noise.

My question is can I replace just the one troublesome lifter and follow a typical break in procedure or do I need to replace the cam and all of the lifters? What is permissible or best practice.

I don't know cam shaft selections.....If Best practices to replace the camshaft and lifters at the same time what can you tell me about the compatibility of these three products from Summit listed below. The engine has stock 340 exhaust manifolds, dual exhaust with H pipe, 8 3/4 with 3.23 gears, and a 904 transmission with stock tourqe converter, 318 street master intake (yuk, but makes 20 inches of vacuum) with original power brakes that need alot of vacuum to work and stock cylinder heads. It can have a little rumble but I need 18+ of vacuum. I selected these cams mainly due to price. The 340 block is at the shop and I will run this motor until the fall and then sell it off when the 340 goes in. What cam would you put in if you have to go all new?

hydraulic Flat Tappet, Advertised Duration 272/272, Lift .454/.454, Chrysler, Small Block
https://m.summitracing.com/parts/sum-k50052

Hydraulic Flat Tappet, Advertised Duration 278/288, Lift .421/.444, Chrysler, Small Block
https://m.summitracing.com/parts/sum-k6900

Hydraulic Flat Tappet, Advertised Duration 276/288, Lift .441/.441, Chrysler, Small Block
https://m.summitracing.com/parts/sum-k6901