LS and 4L80E in a 70, using orig mounts?

[forcd02]

Been working mostly on the bed, waiting on stuff from the sand blaster, so I yanked out the six banger and trial fitted the 5.3 and 80E trans. I had some old mount adapters left over from another project, so I used them along with the six cyl mounts-I rem. the bolts from the frame mounts so I could move stuff around, bolted everything on the engine and dropped it in-I may have to weld up the top holes in the frame mounts and redrill-biggest problem I see is the 80E pan is going to hit the cross member where the six cyl bell housing was mounted-I may be able to trim it, and cut the body flange.
Curious if anyone has used the stock frame mounts on an LS conv., and if you had clearance problems with the cross member installing an 80E.
I have a new cross member for the trans-the truck pan hits the front cross mem., but I have a Holley pan I can use for that.