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Ernie, The sidepipes you have won't bolt up to the standard header. They don't reach in as far as the stock sidepipe.
I can get 302 headers for $350, plain sidepipes with the good mufflers are $350. Front Carrera coilovers run $390. Rear Pro-Shock coilovers run $390.
You will need to have the sidepipes and headers coated. They came as plain steel. The weight of the sidepipes is supported at the front by the headers. I haven't seen a problem with this and I'm pretty sure everyone does it that way. Since the motor has to move from the engine torque the only way to eliminate it is with a solid motor mount.
Don
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