If you are just going to sell the car. I would put as little into the car as possible. There is a lot of work that goes into a V8 swap besides just having the V8 to put in the car. While you wont need to swap the k-frame on the first gen cuda to put the 8 in . you will need a new/used centerlink...
While I have never owned a 340 . I have had 3 Boss 351s and they were a blast when you were pushing them hard . However due to the large valves and massive intake runners the cylinder heads were better suited to racing than being used as a DD . If I remember correctly the Boss 351 was developed...
The 200 4r is a better trans all around it has the same gear spacing as a 904 with the added benefit of an OD . It is smaller that the 4l80 not to mention being lighter and can be built to withstand as much as a 4l80 or a 727 with less parasitic power loss.
BTW if you are worried that the 200...
Dart270 on slantsix.org ran that setup on his 66 valiant . He told me that the carbs had sat around too long between running them again and didn't perform the way they should have . His new plan is to use the dcoes as throttlebodies on converted to mpi manifold . I will say that the setup looked...
I am new to this forum but not to A bodies though i haven't owned one in 20 years . The last few years my brother-inlaw has been getting me interested in A bodies again ( he has 4 ) .
So here i am reintroducing myself to the wold of A bodies and possibly finding a new project . You can...