Engine Mount Question

[joesscamaro]

Hello all! I have a question I'm ashamed to even have to ask, but here I am. I've got a '65 that I'm putting an LS1 and 4l60e in. I'm using the Dirty Dingo slider mounts and I feel like I've read in my searchings that I can use my original engine perches (SBC V8) and the rubber engine mounts from the same SBC V8. I must be reading something wrong because I can't get the bolt holes in the perches to line up with the forward 2 holes in the frame. I know I have to drill a new hole in the crossmember. It just seems like the engine perches are too wide to line up with the holes in the frame. I can get two bolts in on one side but then I'm fighting to even be able to get one bolt in on the other side. It just seems like they are too wide for the existing forward holes in the frame. Any input? I did just read on Dirty Dingo's site that they recommend the 67-72 V8 perches. Does this sound right?