by lord13 » Thu Sep 15, 2016 9:27 am
It will fit, use the HA box though as it is shorter than the HC unit.
Basically, swap your engine mounts from the HA Engine to the HC engine, unbolt it from the gearbox and whip it out, check your clutch diameter and splines on the friction plate, you may need to use the HA clutch assembly ...maybe even swap the flywheel over, but possibly not. bolt up the HC lump to the HA box and away you go.
And now would be the time to junk that old voltage regulator and dynamo ( if you have them still fitted ) in favour of an alternator, simple swap, junk the *Bleep* old stuff, check online for correct placement of cables and connect it up. much better charging system, and much more reliable.
hope this helps