Can’t get engine mount bolts to budge

My last ditch effort (until tomorrow when the day starts anew & I do it all over again - Groundhog’s Day).is to go up the street & get crow’s feet. That way I can hopefully get some leverage. Just not sure how they'll hold up. Never used them before.
Will it make any dif if I raise the engine a hair? Take some pressure off the mounts? Or rather, is three any reason I shouldn’t try this?

 

yes. lifting engine just a tad should help.

 

Yeah. You can lift it a bit to take the pressure off the mounting bolts. Ive always done it that way with no problem.

 

Penetrating oil, hammer blows and heat are your friend in lieu of ability to access bolts with an impact wrench.