Bolt pattern pros/cons

[Tree-50]

Have a 6 lug, drums all around, no booster on my 68. Will be swapping discs in the front but haven't decided if I want to go 5 lug or stay 6?

My girl's dad said he has a rearend, probably out of his camaro at one point that does have posi trac and is 5 lug, though I don't know the gears or the actual pattern, if 5x5 or what. Or if it'll even fit, it's a 68 z28, if it's actually out of that car.

Are there any advantages of switching to 5 lug?

I really want to run a smoothie style, baby moon setup if that makes a difference.

Also, if anyone has run the mcgaugheysuspension conversion, that let's you keep all your year model parts, ball joints, arms etc and could offer any insight to if they like it or not? That is why I haven't pulled the discs out of a 72 or anything. Didn't want to have a frankentruck if that makes sense.