I've got the urethane iso pads and they seem to work just fine. Zero wheel hop, even when the right foot gets a little rambunctious. If I could do it all over again, I'd go with a small block. The original S6 to 440 swap was in 1989 (before Schumacher, etc..) and I actually had a 360 and 727 all set to go. Then a buddy said "if you're going through the work to put V-8 in, why not go all the way and get a 440". What a stupid idea,,,,,,,,,,,,,,,,,,on the other hand........When others heard they kept telling me "it'll never fit", "it can't be done" and you know what I HAD to do then. The 440 became a 500 about 6 years ago and it's in there to stay. It's fine except the weight up front is obvious when you come to curves. It's no autocross champion by any means but I'm fine with that.