http://www.914world.com/bbs2/index.php?showtopic=194179#76-914, might want to recheck that length, I seem to recall the length of an EZ30 is only 1" to 1-1/4" (30mm?) compared to an EJ25. The EG33 is considerably longer because it uses the EJ architecture with an extra cylinder.
http://www.thesamba.com/vw/forum/viewtopic...sc&start=29The answer might lie in your fabrication skills, I don't think an EG33 clears the bulkhead with Ian's (Coldwater914) engine cradle. So you might need to plan your own mount/cradle if you go the EG33 route.
There is also the EZ30D vs. EZ30R question . . . .