1969 Plymouth Satellite

Hi New to this board. Thanks for accepting me. I just got a rust free 1969 Plymouth Satellite that came out of Ga. the former owner was redoing a lot on the car. It has the 318 motor cam,{he had just replaced}high rise manifold 4 barrel carb, and I put on headers and dual exhausts with cherry bomb mufflers.{it has no exhaust system} Questions is I got it home and got her road worthy again. The motor was quite but now the lifters are chattering, she still runs like a scaled dog but I am not sure if the former owner replace the cam and use the old lifters? Any ideas what to do or look for.Thanks Bruce.View attachment 1715453366

First thing I would be doing is not running it any more 'till you put a oil pressure gauge on it!