i have a stock 6 cylinder and 4 speed in a 51 chevy truck, can I remove the engine and transmission together ate the same time? Or is it best to remove the engine and transmission separately. I need to replace the rear main seal,oil pan gasket,front timing chain cover gasket and seal,valve cover gasket and what ever else I can find leaking oil.I will also repaint the engine and transmission,install Fenton headers,dual carburetor manifold and oil fitter,any additional info on their installation would be appreciated.By the way, the engine is a 1954 235 cu.in. Thank you.