Camshaft dilemma

So I popped of a valve cover (actually pried from all the TRV) yesterday to see what
rockers the person I bought the car from put on. This is the cam details that he gave me: Cam, Lifters, Valve train, Mechanical Flat Tappet, Duration 274/280, Lift .502/.511, Mopar, 383-440
With mechanical flat tappet I expected to see adjustable rockers, not so. It has hydraulic rockers and lifters.
From all that I have read today this is a bad combination.
Asking to get other opinions on this and what would be a good cam to replace it with.
I am running the stock carter 4 barrel and stock exhaust manifolds going to 2.5 inch flow master x pipe system.
The engine is 383 to 727 trans to 3.23 sure grip rear. Thanks for any advice