What is the best motor mount to use for a daily driven, slightly modified 289 block? I've used the stock mounts available from Discount Auto Parts the last time and they have separated (3.5 Yrs) I 'm sure this is the cause of the vibaration I feel at 75+ mph. I've replaced any bad parts of the suspension, done a front end alignment, trued and balanced the tires. I put the jack under the oil pan and lifted it up and I could see light between the mounts. If I remember right, they shouldn't do that . So I hope that I would only have to do this one time ( I had a front end 30mph accident that may have caused this ). The TCP 's look good but $250 is a bit much. If I spend that kinda $$$$ I'll have to do it myself otherwise I'll let the mechanic do this one if they are more $$$$ friendly ones available.