Some time back there was discussion about some pretty fast cars running FOUR stud such as Mustang/ Falcon/ etc stock bolt circles. I guess you have to ask yourself, "just how much is enough."
5 on 5, left over from olds/Pontiac swaps into chevies, going back to the late fifties.
Got 5 on 5 in my nine inch that was built in the seventies (summers bros axles).
I also ran a nitroused 327 in a Vega with an 8 3/4 swap...... and a FOUR lug conversion.