we found out that the STX21 cam that came with the used HEMI that I bought is worn beyond specs, so a set of new camshaft with lifters is on the line.

I'm looking for a cam in the 300° adv.duration and .550 lift at the valve range.

Which cam would you recommend ?

The lifter bores are .907. Should I stick with standard .903 lifters ? Which solid flat tappet lifters would you recommend ?