The previous owner of my 1970 Malibu had a supercharged 454 installed that not too long later got stolen, and the original 307 was replaced (he still had it). Now I've had people tell me that you need stronger shocks to support the added weight of a 454, is this true? I asked the previous owner, but he said he didn't know. Now i'm wondering if I still have the 454 shocks in it, and how do i find out? If they are in there, does this affect the performance? Thanks.