Should I switch to gas(Mod/Con) or replace burner from oil to gas

Hi, I am running an oil system with steam and I am being told to switch to gas. The boiler seems relatively new got with house in 2010, house was made in 1930. I have attached a few pictures of boiler and also the piping which a plumber said he thought was piped incorrectly. I notice the radiators to the left side seems to get way more heat than radiators on the right also, based on the loops in the pipes from my layman eyes piping seems inefficient. I have been playing around with gorman valves to try and balance the system(Thanks to this forum) I have no intention of selling this house anytime soon. I have gas in property for water heater and stove. (I am located in Bronx, NY) I don't think my oil bill is super high compared to other folks I know but my buddies using gas claim their bills are way lower. So my question is should I switch burner to gas or replace the entire unit and do over pipes etc?. I see lots of mention about mod con. TIA Robert Image may be NSFW.
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