It may be more difficult than that. Spookshow's website says it had body-mounted Rapidos, so those are likely T-shank MTs in the original boxes. If so, those boxes will probably have to cut/filed/ground off.
If it's a plastic floor, that won't be hard. If it's a metal floor, and many early Con-Cor cars had metal floors, it could take some doing. The alloy they used was hard.