Converting 3pd manual from column to floor.

Two things I understand are real deal killers - extensive rustaway to the crossmember where the T-bars attach, and serious collision damage to the B-pillar area. Both of those can get involved.

Since this is a convertible you should consider welding in subframe connectors, these aren't expensive and will really help eliminate body flex. This would be a good time to weld in replacement floorboard panels too.