The shifter I used was a Mr Gasket V-Gate inline shifter , used it for years untel some High as a kite POS ran into it ,Totaled , some top loaders had two postions to install the shifter on the tail shaft houing , some only had one , fwd or rearward , I used the rearward holes and the shifter boot covered the huge hole just right and in stock location , I was lucky back then because we had a warehouse next to the speed shop and they were alway borowing our forklift so they would let me try the diffrent shifter set ups to try , and also never heard a top jam up like that ,