What Cam and lifter set for stock 1965 273?

I have 65 273cid in my Barracuda. After talking with Mopar mechanic I have discovered that someone may have put hydraulic lifters in my solid lifter cam
engine. I could not adjust the valves properly no matter how I tried . I haven't taken the engine apart yet to verify. Lets say I take it apart and it's true. What would be an appropriate cam and lifter set to install? I would like to increase HP a little. Maybe go from the 2 barrel to a 4. Any suggestions?