Matt,

I actually like the original A10 for its fuel economy and honestly
feel the round port heads match it very well for a streeter.
Id like to see a high revving a10 but to make the 110-130hp mark
it will be an absolute nightmare under 5000rpm.

However I also like the a14 crank in the early a12 block idea
for keeping the engines original mounting and configuration.
The a12/14 hybrid will have a lower rod stroke ratio which will
boost intake charge at lower rpms and make it a better performing
road/street engine as it should shine at lower rpms.
This is what modern engines aim for to improve efficiency below
5500rpm which is which suits everyday use.

The early a12 should be your best bet for originality and enjoyment as
its an A series with the a10 layout and better 4 bearing crank.