I'm in the process of rebuilding a IV Classic that I purchased in parts. The firewall forward that came with the deal is off of a II with a 582. I have assembled the engine mount frame to the fuselage and started reinstalling the four piece cowling and as I suspected, the upper rear cowling does not fit because of the different slope of the diagonal members by the windshield. The lower rear cowling and the 2 pieces of the ring cowling appear to fit. Does anyone know if a new upper rear cowling for a IV would fit of be fitted with minor modification to my exhausting II lower cowling? Any other suggestions?

Thanks,
Mike