@armyadarkness @GrandTO . Posted a video of header hitting control arm.
The engine mounts are new, albeit Autozone factory. I guess now is the time to buy once cry once--is there a con to have solid engine mounts? I feel like they would put additional strain on the frame.
Shimmming the frame mounts is what you are referring too, yes?
Yes. Frame mounts. Below are the Butler Performance 3/16" spacers.
IME, there has been some debate about this as everyone seems to be right depending on what they are trying to accomplish: The pro to the solid mounts is less movement and better power/torque transfer / The con to the solid motor mount is less movement and little isolation. If the goal is to eliminate engine movement and you don't mind some vibration, they're great. Otherwise steel reinforced rubber is similar to what Pontiac used originally. A polyurethane/steel mount is said to be a good compromise as it offers some vibration isolation along with less movement. Butler Performance recommends wrapping your headers if you wish to go the poly route. Really depends on what your after. Your engine looks pretty stock on the outside. I realize that it could be stealth instead of stock. Not sure what you intend to do with the car other than enjoy it of course!
I would ask Butler what their thoughts are on the rubber/steel/poly pros and cons for the mounts as well. I'm sure they'll have some really good expertise in that area.
Before you buy anything though, now would also be a good time to mock everything up that has a chance of interfering with headers and vice versa. Lift your engine 'til it clears the items in question move lines, check clearances, and factor in wrap if needed etc.
Enjoy the Green Beer!