rebuilding a 273 180 HP engine

..... On the cam, good luck, the solid lifter ones (stock) are no longer available but Schneider cams, http://schneidercams.com/solidliftercamshafts-10.aspx makes one with a little more lope to it....

Racer Brown, Isky and Hughes all have a cam thats close to the stock High Performance cam profile. I know melling made a stock replacement at one time, could also check with them.

I have one of the melling stock replacements (used)(Part Number SPD14) and matched solid lifters that was in a 273 I parted out.