This the place?

[Fla 66 cuda]

Originally Posted by Smitty Nice! 273 was in line with the 283, 289? Was there a high performance version?

Yes two 273's were offered
one was a 185 hp 2bbl / 8.5 to 1 compression
second was a 245 hp 4bbl / 10.5 to 1 compression
both were solid lifter motors
the latter was an option for all barracudas but mainly found in the formula S cars backed by a 4 speed.
fourmula S cars were the top of the line barracudas for 65-66 standard disk brakes,14 inch wheels,larger rearend,suretrack,swaybars,extra badges on exterior,console car.
Like anything else back then you could get most of these options on a standard cuda [except the badges].