well just to clarify, the heads are not off either motor at this point and wasn,t really planning on taking them off, the 318 in my sons truck runs just fine, I get what your saying about the cracks but I dont have any reason to suspect a problem, we simply took the motor out to ease with the conversion to the 4 speed std and because we experienced a blown frost plug this past summer so thought this was a good time to remove the engine and replace all the other plugs as a precaution, then at the same time we are cleaning, painting, and freshening the motor because we take the truck to local car shows through out the summer. But here is our dilemma...we have done some work to the 318 to "warm it up" a little bit and had plans to do a few more mods, cam, headers etc, but as it is only a 318 , not really a performer to begin with, would we be better to "switch gears" at this point to something with more potential, a 340 is out of the qustion, too rare and expensive so a 360 seemed more practical but as most are "smoggers" not really much better than the 318 without pouring loads of money into it we thought maybe a compromise would be this 360 if it was from the higher compression area, ( this is also a running engine so no need for expensive tear down)and all of our parts, steering pump, altenator, dist, carb, etc would bolt right on, now that being said what we thought we currently owned was a smogged down 318, but if "TWX" is correct about the 302 swirl port heads then maybe this 318 has a little potential after all so I guess my son and I have some more thinking to do on this before we procede much further, one last thought...as we are removing the auto we now need a flywheel, apparently the 318 and 360 are different?, not sure what though, so I guess we will have to hold off on ordering one untill we decide which engine to use dose any one know of a good quality aftermarket flywheel, they all seem to be "off shore", which usually means junk!, sorry for the long post but just thought I should clarify what we were doing to this little truck, thanks