Pros&Cons of POLY MOTOR MOUNTS
https://ls1tech.com/forums/showthrea...ght=poly+mount
https://ls1tech.com/forums/showthrea...ght=poly+mount
etc., etc.
Engine mounts will solve it if engine roll is your problem.
Lot of people grind on the K-member for extra room.
Since you have to jack the motor a bit to do this swap
(which is a time consuming pain in the ***) you may
want to do both if you have a die grinder and a burr
that will get to where you need it.
There's a lot of steel there and I think another strategically
removed 1/4" wouldn't hurt much. If you saw how scrawny
the aftermarket ones are, you wouldn't be worried at all.

