Difference in 273

Chrome unsilenced air cleaner with "273" callout, Carter AFB carburetor, 4 barrel intake manifold, a slightly hotter camshaft, 10:5 to 1 domed pistons, a low-restriction single exhaust system/muffler, dual-point distributor, aluminum-finned/krinkle-black painted hemi-style valve covers. Did I forget anything besides the advertised 55 horsepower increase (235 HP vs. 180 HP)?
P.S. Yes, forgot about the chrome PVC cover and breather along with the upgraded valve covers.