Valve train upgrade

So I have a 66 Barracuda with a 273 Commando. I just bought it this summer and it had a valve train noise. I pulled the valve covers and found it has adjustable pushrods, hydraulic lifters and non adjustable rocker arms. I found that #2 exhaust pushrod had backed itself off. For now I adjusted it to the length of one of the other pushrods. I don't like this setup at all just wondering if there are any suggestions? I definitely don't want adjustable pushrods! I also wouldn't mind a new mild cam! Should I get new cam, pushrods, lifters and adjustable rocker arms? Any suggestions would be great! Thanks in advance!

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