Its reffered too as a 'mini me'... Its possible... And worth it... *IF* you do it right and know what your doing...

http://www.honda-tech.com/zerothread?id=554053

But make sure its a VTEC head first! (and not a VTEC-E head) Not all 94 Civics came with VTEC, only the Si's and EXs did... The VX came with VTEC-E which is an economy version, you dont want that...