if you want to see how most car motors are converted into boats ahve a look at jetboats and mud boats hope that helps

Hey guys I was wondering what I would need to do to convert my 16.5 foot fibreglass boat from an outboard configuration (now deceased due to a cracked block) to an inboard with A series power!!.
Would I need an auto gearbox (as I need reverse) what prop would I need? Would I use a jet assembly??? Any ideas appreciated.
I want to use an A15 with twin webers