Bought this clean low mileage Riv with a bad engine. Standard 307 Olds motor. Thought Id had everything unbolted and ready to pull but it wouldnt budge. After looking deeper I found a second set of mounts / supports between the differential on the left and the drive shaft support on the right. Removed the bolt into the block on each side and now it will move but seems to still be hung up on the R side. Nothing I can see is structurally attached.Anyone done this and have some input?