The stock manifold needs slight mod to fit. Using a torch and crescent wrench to make frame mod. here's a video of a swap.
https://www.powerblocktv.com/episode...p#.WIJEHk0zWUk
First question would be are you going to run A/C? if so then read this thread its a later year but same concept
http://67-72chevytrucks.com/vboard/s...d.php?t=413855
By moving the stock frame mounting bracket back an inch or so the A/C compressor will fit, otherwise you need to by the adapters to mount the compressor on top of the engine. The 67 should have pre drilled holes to move the mount back, but it's more like 2+ inches, so I might need to just drill some holes. I have not dropped the motor in yet to see just how it fits. Between the weather and other things needing attention.
Maybe next weekend.