Baldy got the long and short of it.
The 194/230/250/292 heads all interchange, including the later integral. They all have the same disadvantage, Siamese intake ports. The 194 combustion chamber smaller and will up your compression, unfortunately it is all so limited performance wise because of valve shrouding. Inliners.org has a partial listing of heads and combustion chamber size. If you need to know what it takes to get performance out of one of the heads check out
http://www.t6racing.org/Larry
