4.3L Engine Swap

[carterS10]

I want to awap a 4.3L v6 for my 2.5L in my 91 S10. Has anyone done this?Does anyone know how complicated this is and whether or not the transmission will need to be replaced?

[mattro]

im pretty sure the 4.3 is a 90 degree and the 2.5 is 60 degree so they dont match up