I think the CL did have a different engine bay then the 5th gen Accord. The exhasut B-pipe was longer, hinting the bay may be a tad wider in length for the 6.

If you own a 5th gen wagon an H22 would be a much easier fit, why re-invent the wheel, plus you can get a manual if you choose. For much less $$$

If you really want to spend the cash and go full out unique I would attempt to do a k-series from an RSX or TSX, but you would need to rewire the entire car and likely work with a shop with the skills like Hasport to custom make a set of mounts. not a small task.

I would either do a an F23A1 sohc Vtec form a 2.3 CL of your vintage built for nitrous or swap an H22, both would give you the added oomph and best bet for a daily driver.