The Beta Marine
Atomic 4 replacement engines are engineered to fit on the same engine beds as the standard hard bolted
A4 and the shaft coupling will line up with the shaft.
That said, there is a lot else that will be needed to do to accomplish a reliable installation
. Expect to have to change the following;
2) possibly the intake thru-hull to a larger size,
3) the propeller
and sometimes the shaft,
4) the control cables
and sometimes the Morse control as well.
5) the fuel tank
will have to be properly cleaned to get rid of all gasoline residue and dirt at the very least. Sometimes a new tank is needed.
6) a proper diesel fuel filter
seperator must be fitted.
I hope that this information is helpful to you.