462 C6

The bellhousing pattern is different on a 462 and it's mating C6;



Also, the output shaft and yoke on the slabside Twin-Turbo (LX) are unique and you would have to modify this feature on a later C6 swap.

The 460 used in 1968 required frame modifications from the factory so you would have to allow for that in your 65 LINC also if you decide to go that way.