I am re-installing a Johnson J90MLCNB power head (complete rebuild) to the mid section and wondering if there are any components that must be installed before mounting to the midsection due to bolt access issues. Heads, intake and exhaust cover are installed and was going to mount the power head. I remember difficulty removing some bolts before separating the two but, it has been way to long ago for me to recall. Thank you in advance for any responses.