273 Performance build possibilities.

What do you have now. A 273 is a great little engine, no special parts needed. Zero deck, closed chamber heads, heads that flow about 190 cfm with a little clean up. Forged crank, solid cam and valve gear from 1964 to 1967. 265 hp with Isky E-4 cam and 2 barrel pistons. Torque from 275-300 ft lb. They are a quick revving engine and easily rev to 6,000+. They can get good mpg if you try.