I'm swapping in a SM465 in my 85' Blazer, the tranny is out of a 78'. Question is that i am going to put hydraulic clutch instead of mechanical in it, but which clutch set (pressure plate, disc, throw out) should i get? A 78'set up for mechanical or a 88' set up for a hydraulic? Does it matter? Do i need to change out the Bellhousing? Or can i keep the one for the 78'?