Re: 140 for 120 mercruiser swap
If the 120 is locked up, then it's a no brainer. The 2.5L and 3.0L are compatible. I think the crank is different after 1986 but that only means swapping the flywheel and coupler.
Ayuh,... The motors are Very swappable, 'n the rear main seal change is I think '90 for the In-line motors,...
'86 is the V-motors,..
The Differences are 20 hp,......
'n the 3.0l has a harmonic balancer, rather than Just pulleys,...