I agree with the guys above I have done numerous engine swaps and they are never easy.You better be a good fabricator or have very deep pockets.If you expect to finish the job.
You can build a traditional Pontiac without E-heads that will rip a LS1 apart. My Iron headed 455 makes 580-600H.P and 600 ft.lbs of torque all day long.
Another point to consider is resale value who wants a Bas#%*d engine in their classic pontiac GTO I bet not very many people.
The LS1 will NEVER make the torque that a Pontiac will.
I could understand a 400-455 swap in a late model T/A thats cool. But not the other way around.
However it is your car so do what you want dude. Good Luck
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