Convince me to not use this carburetor.

lol.... idk. You'll have to click on the link and ask all that to the person selling. Your opening post said slant six 2bbl. I dont' know about the aussispeed and cfm's.
OK, let me further explain why I am choosing the Aussiespeed 2 barrel intake.
Since the Aussie intake has a Holley bolt pattern which would not require an adapter, because I hate adapters, I could currently remain within a budget which would allow further upgrades when I can tap into my 401K in four years.

Since the Aussie intake has a Holley bolt pattern, and injector bosses, I could convert the car to either a Holley Sniper 2 barrel, or install multi port fuel injection, at a later time. I would only have to remove the intake 4 years from now to get it machined for fuel injectors. Does this sound reasonable?