You could look for a E21 320/6 or 323i head with the 200 casting and bolt everthing up ok and there should be a few of those around for cheap over there. If you feel inclined you could grind the ports out to match the L-jet inlet manifold and you will be good to go. I know the M20B23 731 head is not common in the US so that is probably the best bet for little money rather than fork out for an M20B25 885 head.
In the long run you will want to go M20B25 motronic and if you have the 272 cam, look for a M52 E36 crank from a 328i and that drops in sweet, use your 2.3 130mm rods and you will have a mean M20 that will blow the 2.3 into the weeds...220 bhp!
epic link here: http://www.e30zone.net/e30zonewiki/index.php/Building_a_2.8