I have run a 727 and a 10.5 bell and had to flatten the seam on the trans tunnel to make clearance. I have used the exact mounts 65dartcharger has for sale with good results.
Is that where your trans is hitting?
transmission hits mostly the bell housing, can raise engine high enough to get correct mounts in. I have the steel parts from the factory 273 in it now with 69 isolater in place, however there is no way an oil pan will fit the engine sits to low.
