which frame mount holes do I use for olds

[84dragcutlass]

Thanks guys that helps a lot, as for the manifolds i have a set of the hp exhaust manifolds for the 455 so im not going to waste my time and money on headers that most have to wrap around the frame. Want to make it look like it came with a 455

 

[FE3X CLONE]

The W/Z manifolds will fit just fine. I ran them on my 455 for years and to be honest, if I was building another hot street car with a 455 I'd go that route over headers any day. Cheaper and a lot less headache.