[chrismorse]

If I recall Bruce Andersons comments correctly:

Mileage goes from something like 20-23 to 16
Power is up roughly20-25 HP
The conservative CIS cam timing and compression ratio limit the upside potential,
Unless you do an overhaul, but that is big bucks.
You loose a bit of reliability and smoothness but get better throttle response.
And as has been stated, there is "THE SOUND" and the gas aroma.
I doubt you will be able to pass the annual smog test required for registration renewal, (not required in some counties)

Spend another couple of bucks and get electronic TBI injection:

Better fuel mileage than CIS
Better throttle response than carbs
more power than carbs
no smell
smoother engine performance than either.
might pass the sniffer test, but I doubt it would pass annual smog, unless the manufacturer has a papal dispensation.

Like any big changes, It is always cheaper and faster to jump into a buddy's car that has already had the modification you are considering - Feel the difference and see if you can carry on a conversation at cruise.

Talk to the PMO guys and maybe one or two shops that specialize in installing/tuning TBI to get a better idea of costs.

I've got a 74 that still has the cis and if I trip over a bucket of money, I will go TBI in a new your minute.
I also have a 77 Ferrari 308 with 4 40mm webbers, (stock) and it has that aggressive howl beloved by all - but my wife, (always) and I, (occasionally) use ear plugs on anything but short hops.

I must be getting old,
chris