The motor mounts are the same, so that part of the swap is a drop in. Do you have any of the brackets from the 455. Some of the 301 bracket for the accesorys are different than the 455 due to the lower deck height of the 301. I don't remember which ones for sure though. It's been a long time since I have worked on this kind of swap.
No the Chevy TH400 case will not fit behind the 455. What kind of transmission is in your car now?
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North Dakotas fastest REAL GTO
10.10 @ 131 MPH in the 1/4
Hoping to get it back together some year.
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