Sounds like the way to go, Don.

Regarding the mains, you should be okay. I don't see that the 426 ones were different from those in your 413.

If the crank in your '65 engine is original, that's a plus. Up until '71 the 413's had forged crankshafts. After that they were cast. The forged type is considered to be a much better crank. If there's any doubt as to whether you have a forged crank, look at the counterweights. Forged ones have rounded off edges. Cast ones have sharper corners.

And, as I suggested, look around for a set of the 906 heads. They shouldn't be very expensive and I'm told that they are superior to the standard 413 items. BUT.... take a little care here..... if you are able to go with the 906's you may have to get your friendly machine shop man to notch the top of each cylinder bore just a little to provide clearance for the larger exhaust valves.

A lot of guys like the 413's. I bought a '70 Dodge 3/4 ton back in the late seventies and somebody had replaced the original 383 with a 413. That was okay with me, but it had one zero compression cylinder and one that was so close to zero that I'll call that one zero, too. A friend wanted a 413 badly enough that he traded even with me for a good-running 383 and he even did the swap for me.

Feel free to send me a PM if you have questions. I'll see what I can find out for you.

Jim