Being able to work indoors does make ithings easier. The later 235 blocks used side engine mounts where earlier versions used front engine mounts. For a time blocks were cast so you could use them either way. Just one thing to check. Another thing I found was the pin the accelerator linkage mounted to had 2different spots it could be threaded into the block. On my 48 someone butchered the linkage after an engine change when it would have been easier to just move the pin if they had realized the block made allowances.