the 5in will be the better charger as the 9in is too big and in the air cavatates in the manifold.. where the 5in wont have that problem..
as for the life span of the charger you shouldf get about 1K or more out if it as long as nothing goes throu it and it has a good oil feed and drain..
on porting what 13B are you going to use???? as there a different HP rating on what block you want to use..
Dan
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