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Transmission mount cross member, re route the fuel line and replace the engine mounts.
You will want to change the front springs to carry the extra weight you are putting on the front end and will need to have a driveshaft made to fit the longer trans.
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You will need to adapt some headers to clear the steering and add better cooling with a bigger radiator. This is not a hard swap but somethings will have to be altered to get everything to fit. The aftermarket has the mounts and a cross member if you don't have one from the donor vehicle. The holes should be in the frame.
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If you get the old Car-craft issues they have done a few of these. I did one and if I had the choice today I would be putting an injected LS in this to have the fuel injection and a 700r4 to have the overdrive. You will be happier unless you want to go fast in a straight line. The LS3 6.0 will make at least 100hp more than the '77 454 will in stock trim and they are not that expensive. You have a cool '68 Elco it deserves an engine to match.
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