Get both sets of mounts from a 301 and as long as the 400 is a 70 up and it's a bolt in. I would upgrade to a Turbo 350 transmission as you don't have to change the driveshaft.
I did this conversion on my 85 Grand Prix.
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1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear
85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book.
87 F350 6.9 4 speed dually
A poor man has poor ways.
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