You’ll be unhappy if you ever need to buy a angle valve cylinder, they’re more than twice as much and only available from lycoming.
Nope. Even Continental makes PMA IO-360 angle valve cylinders for Lycomings.
http://www.continentalmotors.aero/parts/faa-approved.aspx
IO-390 cylinders are currently Lycoming only, but they did lower the price some time back.
Weights, with stated accessories, as quoted by the factory for the Kitplanes Engine Buyers Guide:
YO-235-EXP direct 118 HP @ 2800 RPM carburetor parallel valve 250 w/mags,fuel system,starter
YIO-235-EXP direct 115 HP @ 2800 RPM fuel injected parallel valve 250 w/mags,fuel system,starter
YO-320-D1A direct 160 HP @ 2700 RPM carburetor parallel valve 255 lbs w/ mags, fuel system, starter, CS
YIO-320-DIA direct 160 HP @ 2700 RPM injected parallel valve 270 lbs w/ mags, fuel system, starter
YO-320-D2G direct 160 HP @ 2700 RPM carburetor parallel valve 250 lbs w/ mags, fuel system, starter
YO-360-A1A direct 180 HP @ 2700 RPM carburetor parallel valve 285 lbs w/ mags, fuel system, starter
YO-360-A4M direct 180 HP @ 2700 RPM carburetor parallel valve 285 lbs w/ mags, fuel system, starter
YIO-360-M1B direct 180 HP @ 2700 RPM injected parallel valve 290 lbs w/ mags, fuel system, starter
YIO-360-A1B6 direct 200 HP @ 2700 RPM injected angle valve 325 lbs w/ mags, fuel system, starter
YIO-390-A3B6 direct 210 HP @ 2700 RPM injected angle valve 315 lbs w/ mags, fuel system, starter
YIO-390-EXP (10:1 CR) direct 220 HP @ 2700 RPM injected angle valve 315 lbs w/ mags, fuel system, starter
YIO-540-D4A5 direct 260 HP @ 2700 RPM injected parallel valve 400 lbs w/ mags, fuel system, starter
YIO-580-B1A direct 315 HP @ 2700 RPM injected angle valve 440 lbs w/ mags, fuel system, starter
YIO-580-B1A (10:1 CR) direct 320 HP @ 2700 RPM injected angle valve 440 lbs w/ mags, fuel system, starter
Generally speaking, installed engine weight is the most nebulous number in all of aviation.