Cusser
+1y
How much room do you have there? Harbor Freight has a 120 volt electric impact wrench for $40 with coupon, I bought one 2 decades ago, it goes to 250 ft lbs. Yes, you'd also need an impact socket.
However, if you're standing, the 3/4 inch breaker bar should deliver plenty of torque, especially with a pipe over it. If the engine turns when you try (brakes on, transmission in gear), some have rigged up a flywheel lock that fits in after removing the starter.