Hola Graham
If you go through the 59-65 rebuild messages you will find that others have
come to this "bridge" before you and have written of their experience.
In an "nut shell", the advice to find an 440 is on target. The auto
parts stores have the things for them, The engine re-build shops still have
them, and they are an bolt in.
The complete top end from your 413 will bolt to the 440's block ( but the
1976-78 440/400 head ending with the #452 casting number is much better than
what you have ). Your intake and carb is better for you since the linkage
to the carb and transmission is designed different. The 1962 air cleaner
will also fit the pre-1968 carb's.
Another item to switch to the 440 from the 413 is the oil pump pick up
assembly and matching oil pan.
Due to the weight of the Imperial, keep the valves the same size as stock
for the the heads that you use and the best camshaft for the same reason is
MoPar number P4286675 ( 260/260 & 0.430/0.430 ) . Many want
to use the restro RoadRunner/GTX cam ( MoPar # 4529270 268/284 & 0.450/0.458
) in their vintage powered Imperial. The second cam will function, but you
get a better driver's bang from the first cam. The # P4286675 cam is also
the cam of choice for the "gonna have it correct" Chrysler 300 driver's.
Do keep us advised and good luck.
Rodger & Gabby
COS
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