I believe that would be your simplest and best course of action.
As the previous poster indicated, you may have to drill your frame to mount the Olds frame pads.
You might save a lot of heartache if you set that BBO in your engine bay for a trial fit before you actually set anything in stone. An Olds 455 is quite wide; check some of the posts illustrating the interference problems encountered by guys dropping those in Firebirds.
BTW, if that '76 455 has "J" heads, do yourself a favor and find a set of "C" heads - much better flow and compression.
Check the parts for sale sections on oldspower.com, realoldspower.com and 442.com.
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'67 Bonneville Sport Coupe, 428, auto, PS, PB, AC, an unmolested original.
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