Well if all it takes is swapping the cowl over and drilling some holes in the grill and cowl I reckon I'd give it a go. I tried googling but didn't pull much up. Now whether to buy an 8 or keep the tj. Hmmm decisions decisions.
Thanks.
If you want it to look right, a lot more is involved than just drilling new holes for the hinges and "swapping the cowl". The TJ has a removable cowl panel but the CJ doesn't, so "swapping the cowl" would involve a lot of bodywork on the CJ tub.
I'm currently building what I call a "CJ Grille Conversion Kit for the TJ/LJ", which goes the other way, but having done the design work necessary to fit everything together for that project, here's a list of the issues you'll face if you try to go the other way and put a TJ front clip on a CJ. These photos were taken to show the issues in putting CJ parts on a TJ but they'll suffice for the opposite case as well...
1. The TJ cowl has a raised section in the center, which the CJ hood does not have, so your hood would have a bulge up that's not matched on the CJ cowl. Putting a TJ cowl panel on a CJ would be quite a challenge, it's more than just doing a little sheet metal work do graft the TJ cowl panel onto the CJ tub because the distance from the hinge line to the windshield is different on the two models so the TJ cowl panel won't fit in the front-back dimension. Some fairly advanced bodywork would be required on this one to get it to look right.
2. The shape of the TJ tub vs. the shape of the back of the CJ hood - the radius on the corner of the TJ tub is much sharper than the CJ, the hood and tub don't match at all at these corners:
3. The side of the TJ hood as a raised accent line, which matches a raised line on the side of the tub. The CJ tub does not have this accent line, so it wouldn't match up to the TJ hood (this photo shows the TJ tub and CJ hood, the opposite case from you but you can get the idea):
4. The TJ hood and fenders are about 2" inches longer than the CJ parts, it's an issue for putting CJ parts on a TJ, but probably less of an issue for putting TJ parts on a CJ. You'd need to deal with the location of the grille mount on the frame, and if you have any accessories on the frame front, like a winch, you might have to relocate them forward.
5. The spacing of the hood hinges is different as bigwalton mentioned already. The CJ hinges are further apart, but because of the raised areas around the hinges on the TJ hood, it would be easiest to use the TJ hinge spacing on the CJ tub. This is an easy one compared to the other issues on this list.