There are people out there w/some built 230's.
It is very easy to make it a 250 & have more power & probably make the same mileage,so why not make it a 250?
You build them just a like you would a 250,or 194 basically.
If you have any questions on cams, compression,cylinder head mods etc, etc, just ask away.
We need to know what your car will weigh, rear gear ratio,tire height,plans on racing, hot street, good gas mileage etc?
MBHD