Ha ha, actually I think all USDM '92-'95 Civic's are technically EJ chassis's (including the hatches). It's just become easier to say EG instead of '92-'95 (I do it all the time). EG is technically the JDM designation for the 5th gen's (including the sedans or Ferio's as they call them).

As for the H22A for autocross, it will work very well. The extra torque from all the displacement will help pull the car out of slower corners a lot more than the high rpm powerband of a B16A and you'll do a lot more of that on an autoX course as opposed to high rpm screams down a straightaway. The added weight will be an issue, but that can be dealt with by using a proper suspension setup that helps rotate the car and cancels understeer. I'd actually be more concerned with wheel spin with the bigger H22A exiting corners than the weight problem. Seeya.