273ci thoughts?

I love 273's. The Piston is at the top of the bore. No need for 4 barrel pistons. If yours is the original 67 273 you should have closed chambers, forged crank and bushed forged rods, solid lifters and adjustable rocker arms. About the only things I'd add would be a small solid cam, Isky or Racer Brown, with valve springs to match, double roller timing chain, windage tray, high pressure oil pump spring, 4 barrel intake, and small Edelbrock AFB or AVS. Your 904 will live forever, change fluid and filter, adjust the bands, and adjust the pressure higher. It is also mated the small pilot forged crank perfectly. My brother put 400,000 miles on his 904 in a 67 Barracuda. Accidently shifted into reverse at 40mph, Topped his 273, 2 barrel converted to 4 barrel as above, at 140 mph and cruised all day long at 100 mph out west. It does not have the torque of a 360, but he never had a problem going fast either.

Any small block Mopar will make power, It's what do you want and what are the plusses each has to start with.