the 455 weights 635 with flywheel and I also got the 1000# lift and had no problem but you always have to be very careful and I also used the high grade bolts to hold the chain onto the motor. I had one chain across the front and another across the rear and bolted them together where it hooked into the lift and the moter was all together with heads, intake, exhaust and so forth, but again use high grade bolts and you can tell which one it is because on the head there will be about eight marks on it, very important to be safe.