4.3 Vortec vs Non vortec, what parts do I use???

[kennys0900]

I just bought a 4.3 Vortec and was wondering what parts are better on the vortec motor that I shouldn't swap over from my orignial mercruiser 4.3 motor. I have heard that the vortec heads and cam is better or just as good as the boats original 4.3? Is that correct then just change freeze plugs, water pump and head haskets? Also I am not sure how much this matters but the boat and original motor is a 93 model and not sure about the year on Vortec motor but it's full fuel injected not throttle body injected.
Also to use the vortec heads I need a different intake manifold? What manifold do I need?. My original 4.3 is a 4bbl motor.

 

[kennys0900]

Re: 4.3 Vortec vs Non vortec, what parts do I use???

I haven't had a chance to check out the flywheels to see if they are the same bolt pattern. Where do you get a 4 barrel intake that bolts to vortec heads? Also what if I have a vortec motor older then 96. I heard that the older vortec heads aren't any better then my boat heads. Would I just use my boats heads then?