+1
I love the IAR-80 as an early war ride. It would be interesting to see how it would handle with a BMW801 (same engine as the FW-190), to see if it could could keep up as a late war fighter.
The only problem is that while the BMW801 was about the same diameter as the IAR K-14 engine, it was twice as heavy. Realistically, the AIR airframe would need to be redesigned to accommodate this, as well as to deal with the increased torque. Stronger engine mounts, possibly a longer nose. Possibly a bigger tail or slightly redesigned wings to counter torque. A lengthened fuselage and/or repositioned fuselage fuel tanks, etc. to get the center of gravity back to where it should be. Arguably, it would almost be an entirely new plane.
An inline engine would be even trickier to fit, since it would have a longer profile, which might cause pilot visibility problems, as well as more center of gravity issues.
All that said, a simple frankenplane could possibly be made by bolting the nose of one of the FW-190A variants onto the existing IAR model, or just tweaking FM, using data from the BMW801.