[LONGHAIR]

I would not even try to use it....It will definately hurt performance and throw your fuel economy in the toilet.
The huge runner volume if the rectangular port manifold will kill the velocity of the incoming air/fuel charge. This results in low vacuum signals to the carburetor...poor throttle response, bad mileage. Then the air/fuel runs into the nasty edge of the smaller port in the heads, this results in what is called "fuel dropout". Fuel dropout is exacly what is sounds like, the fuel drops out of the air, resulting in poor burning...loss of power, stumbling, etc.

Not good.