273 commano on the dyno wooooow

273,I may have an answer(maybe?). My old employer,ports heads for fun know.Done Mopars,since 68.First car,a 273 Cuss.The head castings,sit completely ported for stock valves.Small ,but nice.I can tell you,he ran mid,low 13's @ 102-103 with a small solid and 4.88's.He would know ,off the top of his head.