Motor mount help

[56FMX351]

hello all. I got a 56 mainline with a 351w and fmx trans swap. i ordered the hedman 88400 headers to put on it along with the motor mounts recommended (2725,2726 i believe) i am having trouble getting the mounts in the car. there is just isnt enough room by jacking up the motor. i was trying to avoid pulling the motor. anything else i can try? i have the motor up as far as i can get it before the driver side valve cover hits the firewall. any advise would be much appreciated