jmr82

Hello friends I am having a problem with my 9292 lx 5.0. It has had some work done to it but it was done when I bought it. It has what sounds like a small cam maybe a b and I was told it had an aftermarket set of lifters and rocker arms. So here's the deal it has set for just a little while and now my oil pressure goes only to the first two markes and floats there and what sounds like my lifters are ticking like a sewing machine and it doesn't really go away maybe once I hit 5th gear it will but I wouldn't swear to it. Im not to sure where to start. Would it be my sending unit or the pump? Do I need new lifters or rocker arms? This is my first project car and I've never had a prob like this on any of my other vehicles. Any advice will be greatly appreciated thank you